THE MINING AND QUARRY INDUSTRY 67 



Value of production of pottery 



Ware 



1904 



i9°5 



Stoneware 



$77 726 

 44 49° 

 740 000 



49° °95 



85 823 



$115 890 



3° 74° 

 800 000 

 600 325 



73 °°3 



Red earthenware 



<» Porcelain and semiporcelain 



Electric and sanitarv supplies 



Miscellaneous. . . . 



Total 



$1 438 634 



$1 620 558 





a Includes china tableware. 



Crude clay 



In the foregoing tables relating to clay products no account has 

 been taken of the crude clay entering into their manufacture. There 

 are a few producers in the State which do not utilize the crude clay 

 themselves, but ship it to plants at other localities. Some of the 

 material, like the Albany slip clay for example, is even forwarded 

 to points without the State. For 1905 returns have been received 

 from nine firms engaged in this industry whose total shipments 

 amounted to 6766 short tons, valued at $16,616. Of this quantity 

 3005 tons, valued at $11,886, consisted of slip clay from Albany 

 county. The corresponding figures for the preceding year were 

 8959 tons valued at $17,164, of which 3228 tons, valued at $9630, 

 was slip clay. 



Bibliography 



Beck, Lewis C. Mineralogy of New York. 1842. 



Hall, James. Survey of the 4th Geological District. 1843. 



Luther, D. Dana. Geology of Onondaga county. N. Y. State Mus. 49th 



An. Rep't. v. 2. 1898. 

 Mather, W. W. Geology of New York. Report on First District. 1843. 

 Nason, F. L. Economic Geology of Albany county. N. Y. State Mus. 47th 



An. Rep't . 1894 



Ries, H. Clays of New York; their Properties and Uses. N. Y. State Mus 

 Bui. 35. 1900. 



Woodworth, J. B. Pleistocene Geology of Nassau County and Borough of 

 Queens. N. Y. State Mus. Bui. 48. 1901. 



DIATOMACEOUS EARTH 



Diatomaceous earth is an accumulation of the silicious skeletons 

 of microscopic organisms known as diatoms. Deposits are found 

 on the sites of former lakes, the waters of which were inhabited bv 

 these organisms, and are also being formed on the bottoms of exist- 

 ing ponds and lakes. The purer varieties of diatomaceous earth 

 which have commercial application contain 85 per cent or more of 



