The History of Salt

“M. Barruel states that he observed the occasional adulteration of salt with some hydriodate accidentally in 1824, while preparing experiments for Professor Orfila’s lectures. He also found it in two samples from different grocers’ shops in Paris. No satisfactory explanation has yet been given of the source of the adulteration with arsenic; but the presence of the hydriodate of soda has been traced to the fraudulent use of impure salt from kelp.”29

It will be as well for us to know what pure salt really consists of, to the composition of which I now draw the reader’s attention:

Composition of the Pure Chloride of Sodium.

MM. St. Claire Deville and Fouqué have shown that common salt can be resolved into its elements by the action of hot steam alone, which Lussa and other chemists had thought impossible.

Prof. Meyer, of Berne, has lately demonstrated by experiments on chlorine gas, that the assumption of its elementary character is an error, and that it is nothing more or less than the oxide of a metal which he calls murium. This discovery opens up an interesting question for physiological chemists to investigate; for if he is correct, chlorine is not an element, but is simply the oxide of a metal.

CHAPTER IV

GEOGRAPHICAL DISTRIBUTION

Salt, fortunately for us, is a commodity remarkably easy to obtain; almost everyone knows it is in great abundance in the ocean,30 and there are inexhaustible supplies of it in the earth; it is also present in some rivers, and in no inconsiderable quantity. Mr. John Ashley, in the Quarterly Journal of the Chemical Society, in his “Analysis of Thames Water,” tells us the exact amount:

Composition of Thames Water at London Bridge in grains per gallon of 70,000 grains.

We may account for this great proportion of salts by the fact that the Thames collects its water from the drainage of comparatively soft and soluble rocks; we should also remember the vast amount of refuse organic and inorganic matter which is being continually thrown into this river; and we must also call to mind that it is nothing more or less than the main sewer which receives the ordure of the modern Babylon.31

We may naturally suppose that in those rivers which flow through sparsely inhabited countries, where there is little or no traffic, the amount of saline matter would be next to nothing, and probably not a trace would be discovered. In a river like the Thames, owing to the vast quantity of its shipping, the great percentage which Mr. John Ashley has given us need not afford the least surprise. Sea-water is deficient in its proper proportion of salt at the mouths of great rivers, where the volume of fresh water displaces that which properly belongs to the sea, and therefore a river does not obtain much saline matter from that source.

Before we pass on to consider the geographical distribution of salt, we will just cursorily glance at the position it occupies in the vegetable world. It is present in all plants growing near the sea, and in variable quantities in some of those which are in or near districts where the soil is mixed with salt; though its place is taken by potash when they grow inland. Dr. Balfour writes as follows: “Soda and potash occur abundantly in plants. They are taken up with the soil in combination with acids. Those growing near the sea have a large proportion of soda in their composition, whilst those growing inland contain potash. Various species of salsola, salicornia, halimœnenum, and kochia yield soda for commercial purposes and are called halophites (ἁλς, salt, and φυτὸν, plant). The young plants, according to Göbel, furnish more soda than the old ones. There are certain species, as Armeria maritima, Cochlearia officinalis, and Plantago maritima, which are found both on the seashore and high on the mountains removed from the sea. In the former situation they contain much soda and some iodine; while in the latter, according to Dr. Dickie, potash prevails and iodine disappears.”

Soda being present in those plants growing near the sea, and potash in those which are inland, are two points well worthy of notice, and which we will now discuss. The number of vegetables which are cultivated near the coast shrink into insignificance when compared with those which grow inland; and naturally the markets are supplied with inland produce on account of a larger supply, therefore the consumption of those vegetables containing potash is in the same ratio. This being unquestionably the case, we ought, on that account alone, to use salt freely with our vegetable food in order to supply that which is absent, arising from the difference of locality and dissimilarity of the atmosphere. I shall enter fully into the relation salt bears to vegetable food while it is going through the process of digestion further on, when we come to consider the effects which food salted beforehand has upon the system when continued for any length of time, with little or no variation, which dietary is supposed to be the sole cause of the attacks of scurvy on board ship.

Конец ознакомительного фрагмента.

Текст предоставлен ООО «ЛитРес».

Прочитайте эту книгу целиком, купив полную легальную версию на ЛитРес.

Безопасно оплатить книгу можно банковской картой Visa, MasterCard, Maestro, со счета мобильного телефона, с платежного терминала, в салоне МТС или Связной, через PayPal, WebMoney, Яндекс.Деньги, QIWI Кошелек, бонусными картами или другим удобным Вам способом.

1

The saliva, besides containing water, ptyaline, fatty matter, and albumen, holds in solution chloride of sodium and potassium, besides the sulphate of soda and the phosphates of lime and magnesia. The amount secreted during twenty-four hours has been estimated at from two to three pints.

2

Their food, according to geologists, consisted solely of shell-fish.

3

This sea is called by several names, viz., “The Dead Sea,” “The Sea of the Plain,” or “of the Arabah,” and “The East Sea.” In the 2nd Book of Esdras v. 7, it is called the “Sodomish Sea.” Josephus uses a similar name, ἡ Σοδομύτυς λίμνη – the Sodomite Lake; he also calls it by the same name as Diodorus Siculus, the “Asphaltic Lake” – ἡ Ἀσφαλτίτις λίμνη. It contains 26 per cent. of salt, including large quantities of magnesium compounds; its weight is of course great, a gallon weighing almost 12-1/2 lb.; and its buoyancy is proportionate to the weight, being such that the human body cannot sink in it. At the south side is a mass of crystallised salt, and in it is a very peculiar cavern, extending at least five miles, varying in height from 200 to 400 feet. This sea is 1312 feet below the level of the Mediterranean; the river Jordan, from the Sea of Galilee, flows into it, but no river flows from it.

4

According to C. Velleius Paterculus of Rome, Homer flourished B.C. 968; according to Herodotus, B.C. 884; the Arundelian Marbles fix his era B.C. 907.

5

To show how acute the Greek mind must have been, and how alive the philosophers of that classic country were to everything, whether beautiful or useful, we need only call to mind the quaint observation of Zeno, the founder of the Stoics, who was born about B.C. 300, and who says that “a soul was given to the hog instead of salt, to prevent his body from rotting;” by this we see he was quite cognisant of the preservative properties of salt.

6

Between the Nile and the Red Sea there are quarries of white marble, of porphyry, of basalt, and the beautiful green breccia, known as Verde d’Egitto; in the same locality are found gold, iron, lead, emerald, and copper.

7

A learned author states as follows: “We have seen, too, that the earliest state of Egypt, as seen in the pyramids, and in the tombs of the same age, reveals an orderly society and civilisation, of which the origin is unknown.”

8

No doubt they were proud of their African parentage, and looked upon the hoary monarchy of the Nile with a sentiment of religious awe and unfeigned wonder. Baron Bünsen graphically puts it: “Egypt was to the Greeks a sphinx with an intellectual human countenance.”

9

Probably owing to the existence of salt in Western Thibet and in Lahore, a province of Hindostan, also the Indian Salt Range, which stretches in a sigmoid curve, according to the late researches of Mr. Wynne, from Kalabagh on the Indus to a point north of Tank, both the Chinese and Hindoos may have been equally cognisant of its virtues with the Egyptians, especially when we have it recorded that the Celestials procured it by a process not only original but in a certain degree characteristic of Asiatic combination of ingenuity and clumsiness.

10

Baron Bünsen says that “No nation of the earth has shown so much zeal and ingenuity, so much method and regularity in recording the details of private life, as the Egyptians.” They were also most expert engineers; the canal from the Nile to the Red Sea, which may be called the canal of Rameses II., being protected at the Suez mouth by a system of hydraulic appliances to obviate difficulties arising from the variable levels of the water.

11

“It is a strange fact that the early Egyptians, like the Hindoos, had a religious dread of the sea,”(?); and yet in the reign of Necho, the son of Psammetichus, they actually accomplished the circumnavigation of Africa: the voyage took three years.

12

Dr. Draper’s “History of the Intellectual Development of Europe.”

13

“One momentous consequence of the Shepherd conquest appears to have been that the expelled Shemites carried back with them into Syria the arts and letters of Egypt, which were thence diffused by the maritime Phœnicians over the opposite shores of Greece. Thus Egypt began at this epoch to come in contact at once with the East and the West, with Asia and with Europe.”

14

“Euterpe,” book ii. chap. lxxvii.

15

Lord Bacon mentions somewhere in his works that the ancients discovered that salt water will dissolve salt put into it in less time than fresh water. The same great philosopher also affirms that “salt water passing through earth through ten vessels, one within another, hath not lost its saltness; but drained through twenty, becomes fresh.”

16

The Russians have a custom of presenting bread and salt to the newly-married bride and bridegroom. In archæology we have salt-silver, one penny at the feast of St. Martin, given by the tenants of some manors, as a commutation for the service of carrying their lord’s salt from market to his larder; an old English custom.

17

According to the researches of the late Mr. George Smith, Babylonian literature is of a much more ancient date than the histories of the Bible; which fact would tend to indicate that the intellectual development of that Eastern monarchy may have been coëval with that of the African.

18

Dr. Draper’s “History of the Intellectual Development of Europe.”

19

Leviticus ii. 13.

20

2 Kings ii. 21.

21

Judges ix. 45.

22

2 Chronicles xiii. 5.

23

Numbers xviii. 19.

24

Ezekiel xvi. 4.

25

Job v. 6.

26

St. Mark ix. 50.

27

Ibid.

28

Huxley’s “Physiography.”

29

Sir Robert Christison’s “Treatise on Poisons.”

30

Sea-water contains 2·5 per cent. of the chloride of sodium; some say 4 per cent.; according to others, 5·7.

31

It is well worth remembering that the Thames carries away from its basin above Kingston 548,230 tons of saline matter annually.