568 THE AMERICAN NATURALIST [Vol. XLII 



purposes. They are between 4 and 5 times as many as in the 

 Bradley papers, which have also been arranged in accordance 

 with the scheme of Chevreul (Milton Bradley, Elementary 

 Color). 



M. Th. Valette, chemist of the government tapestry works at 

 Gobelin, has selected the pigments used with special reference to 

 their durability. The pigments have been applied to paper 

 without the use of oil as a vehicle, so that their durability is 

 thereby increased. The colored paper has been coated with an 

 insoluble gelatin to protect it from the action of water. The 

 paper thus prepared has been cut into samples 20 by 25 mm., 

 and these have been pasted to the pages of the ' ' Code." The 

 book, thus prepared, seems to answer the needs of naturalists 

 far better than any other practicable scheme, and its use should 

 greatly lessen the growing confusion which has resulted from 

 attempts to designate colors by names without any standard of 

 reference. The writer has tested the book in the field with 

 satisfactory results. While not all colors may be matched by it, 

 the results are accurate enough for practical uses, and greater 

 accuracy is at present to be had only by the use of the color 



Jacob Reighard. 



{No. 499 was issued on July 31.) 



