Stone

The value of all kinds of building stone produced in the United States during 1902 amounted to $61,-559,099, as compared with $55,615,-926 in 1901, with $44,321,345 in 1900, and with $44,090,670 in 1899.

Clay Products

The activity in all branches of the clay-working industries noted in 1899, 1900 and 1901, continued during 1902. The value of all clay products as reported to the office of the Geological Survey in 1902 was $122,169,531, as compared with $110,211,587 in 1901, and with $96,-212,345 in 1900. The brick and tile products in 1902 were valued at $98,-042,078, as compared with $87,747,727 in 1901 and with $76,413,775 in 1900. The pottery products were valued in 1902 at $24,127,453, as compared with $22,463,860 in 1901 and with $19,798,-570 in 1900.

The clay mined and sold by those not manufacturing the product themselves in 1902 was valued at $2,061,-072, as compared with $2,576,932 in 1901 and with $1,840,377 in 1900.

Cement

The total production of hydraulic cement in the United States in 1902 was 25,753,504 barrels, valued at $25,366,380, as compared with 20,-068,737 barrels, valued at $15,786,789, in 1901, and with 17,231,150 barrels, valued at $13,283,581, in 1900. The Portland cement production in 1902 was 17,230,644 barrels, valued at $20,-864,078, as compared with 12,711,225 barrels, valued at $12,532,360, in 1901, and with 8,482,020 barrels, valued at $9,280,525, in 1900, an increase, as compared with 1900, in quantity of about 100 per cent, and in value of over 50 per cent. The number of plants using Portland cement increased from 50 in 1900 to 56 in 1901, and to 65 in 1902. The production of natural rock cement in 1902 was 8,-044,305 barrels, valued at $4,076,630, as compared with 7.084.823 barrels, valued at $3,056,278, in 1901, and with 8.383.519 barrels, valued at $3,728,848, in 1900. The production of slag cement amounted to 478.555 barrels, valued at $425,672. in 1902, as compared with 272,689 barrels, valued at $198,-151, in 1901, and with 365,611 barrels, valued at $274,208, in 1900.