()G2 EXPERIMENT STATION RECORD. 



Hho\V8 the active (levelopiuent of tliis industry, <\uv chietiy to tlic increase in the 

 nunilKT of l)y-pro(Uict coke ovens now in operation." The worid's^jroduction of 

 anunt)ninni snlpliate during 1902 is stated to be 548,500 metric tons, and the imports 

 into the United States 16,119 terns. 



The i)roduction of cement, in the United States during 1902 was as follows: " Port- 

 land cement, 16,535,000 1)1 )ls. (of 400 lbs.), valued at $16,637,500, as compared with 

 12,711,225 l)])ls., valued at $12,532,360, in 1901; natural hydraulic cement, 9,083,759 

 bbls. (of 300 lbs.), valued at $4,087,692, as compared with 7,084,823 bbls., valued at 

 $3,056,278, in 1901, and slag cement, 547,175 bbls. (of 400 lbs.), valued at $465,099, 

 as compared with 272,689 bbls., valued at $198,151, in 1901. . . . 



" The pro(Uiction of clay products in the United States during 1901 increased con- 

 siderably over the output of the preceding year, the aggregate value being $87,747,727, 

 as compared with $78,704,678 in 1900. . . . 



"The production of gypsum in the United States continued to inc'rease greatly 

 durin'g 1902, although statistics of produc'tion during this year are not now available. 

 The production during 1901 was 659,659 short tons, valued at $1,577,493. . . . 



"The production of all varieties of jihosphate rock in the United States during 

 1902 amounted to 1,464,668 long tons, valued at $4,636,516, as compared with 

 1,483,723 long tons, valued at $5,316,403, which shows a decrease of 38,955 long 

 tons in quantity and $679,887 in value from the statistics of the earlier year." 



Of the output for 1902, South Carolina supplied 313,365 tons, Florida 759,784, 

 North Carolina 25,000, Tennessee 390,799, other States 720 tons. 



"The imports of potassium salts into the United States in 1902 were as follows: 

 Potassium chlorid, 140,980,460 lbs. ($2,141,553); crude potassium nitrate, 10,505,474 

 lbs. ($299,416); potassium chlorate, $1,209,148 lbs. ($60,429); all other potassium 

 salts, 92,857,009 lbs. ($1,820,585) ; a total of 245,552,091 lbs., valued at $4,321,983, as 

 compared with a total of 231,146,770 lbs., valued at $4,268,067 in 1901. The exports 

 of domestic potash and pearl ash in 1902 were 1,408,342 lbs., valued at $66,027, as 

 compared with 1,077,605 lbs., valued at $52,802 in 1901. The exports of foreign 

 potassium salts in 1902, consisting of potassium chlorid, chlorate, nitrate, and other 

 salts, aggregated 1,266,125 lbs., valued at $59,789, as compared with 633,100 lbs., 

 valued at $43,446 in 1901." 



The world's supply of potash still comes in the main from the great natural 

 deposits of Germany, but explorations in Death Valley and elsewhere in the United 

 States for natural deposits of potash salts are being made with some promise of 

 success. 



"The total production of salt in the United States during 1902, including that used 

 for the manufacture of alkali and heavy chemicals, amounted to 23,849,221 bbls., 

 valued at $5,668,636, as compared with 20,566,661 bbls., valued at $6,617,449 in 1901." 

 The leading salt-producing States in the order of percentage of output during 1902 

 were as follows: Michigan 34.1 per cent, New York 35.8 per cent, Kansas 9.1 per 

 cent, and Ohio 8.9 per cent. 



" The production of soda and sodium salts [including soda ash, bicarbonate, and 

 crystals] in the United States for the year 1902 is estimated at 562,000 metric tons, 

 as compared with 480,000 metric tons for the year 1901." 



While extensive beds of nitrate of soda are being exploited in northern San Ber- 

 nardino County, Cal., most of this salt used in the United States is imported from 

 abroad and comes from Chile. The import of nitrate into the United States in 1902 

 was 330,674.4 short tons, valued at $5,996,205, as compared with 233,692.5 tons, valued 

 at $5,997,595 the previous year (see also E. S. R., 15, p. 131). 



The value of the stone produced in the United States during 1901 was $55,488,137, 



