STATE GEOLOGIST. 191 



1,462,045 tons, which, at 2,000 lbs. per ton, amounts to 



62,215,893 bushels. The total exports and their value for three 



years, are as follows: 



1855 .- 630.154 tons, valued at £208,851 



185ii, 74-\513 " " 216,242 



1857, 651,766 " " 23y,969 



The principal salt producing districts in England arc Cheshire) 

 and Worcestersnire. It is mostly manul'actuied i'rora rock salt. 

 At Northwicli, in the former counly, the bed of salt is not less 

 than 60 feet thick, a mile long, and 1,300 yards broad. 



Salt is extensively manufactured from sea-water on the shores 

 of the Mediterranean, in the south France, and on the western 

 •coast. At the salii.e of Be.ie tl e evaporating surfaces cover 

 an area of 815 English acres, ai d the annual manufacture is 

 20,000,000 kilograms (2,205 lbs. each), or 787,500 bushels. 

 The saline of Baynas yields annually 20,000 tons (757,500 

 bushels), 1,550 tons sulphate of soda (Glauber's salt), worth 

 SO' francs the ton, and 200 tons of chlorid potassium, woith 360 

 francs the ton. 



The total manufacture of salt, in France, in 1847, was as 

 follows: 



Tons. 



Salt marshes of the Mediterranean, 263.000 



Western coast 231,000 



Salt springs and a mine, 76,000 



570,000 

 This amount, reckoning 1,000 kilogrammes to the ton, is 

 •equal to 22,443,750 bushels, and gives occupation to 16,650 

 workmen.* 



Sea water is extensively evaporated by theBiscayans, on the 

 shores of Spain and Portugal. The salines of the lagoons of 

 Venice cover an area of about 1,630 English acres. The salt 

 mines of Central Europe have been celebrated for ages. Those 

 of Vieliczka and Boehnin, in Galicia, are well known They be- 



* For much valuable inform. .lion on the manufacture- of salt, CFptcinlly in Trorcr.seoa 

 report " Oil the extraction of s;ilt from sea-wato' 1 ," by T. t-. H i t, iu Cuiuv'a Geological Re- 

 port for 1S55, republished in Eillimau's Journal, Vol. XX\*2J Col, .nay, 1858. Also Report 

 of Prof. Geo. H. Cuok, in Superintendent's Report el Onondaga talt Spxiugs, transmitted to 

 tho Legislature in 1S53. 



