STATISTICS OF THE GYPSUM AND PLASTER INDUSTRIES. 81 



Production in the United States, by Uses, 1890-1903. In Table 25, 

 the gypsum production of the United States is given for the years 189O 

 to 1903 inclusive, classed according to uses as accurately as possible. 

 It will be seen that the amount ground up and sold as land plaster has 

 increased but slightly during the period covered by the table. The 

 production of calcined plaster, on the other hand, was almost seven 

 times as great in 1903 as in 1890. 



Production in the United States, by States and classes of product, 

 1902-1903. At present the gypsum industry is carried on commercially 

 in twenty-two states and territories, which are named in the order 

 of their importance as producers: Michigan, New York, Iowa, Texas,, 

 Ohio, Oklahoma, Kansas, Wyoming, Colorado, Utah, Virginia, Cali- 

 fornia, South Dakota, Nevada, Montana, Oregon, and New Mexico. 

 The other five states do not produce gypsum, but contain large 

 plants to which the raw material is shipped from other states and from 

 foreign countries, and converted into wall-plaster and plaster of Paris. 



In table 26, which shows the production of gypsum by states for 

 1902 and 1903, it has been necessary to combine the output of certain 

 states in which there are less than three producers in order to protect 

 individual statistics. 



