876 NEW YORK STATE MUSEUM 



One of the prominent changes that has taken place recently is 

 that in the relative number of plants using marl and using lime- 

 stone. This change is shown in the following table. 



1899 1900 1901 



f marl and clay. .... ., 4 3 3 



Active plants using ^ limestone and clay. . 13 4 



L limestone and shale, 1 



Another very significant feature is shown by the following table, 

 giving the types of kiln used: 



1899 1900 1901 



f dome kilns . . 4 3 2 



I 



Active plants equipped with -{ Schofer ..... 1 1 1 



L rotary •••(••] 2 6 



