172 
IMycologia 
erclla although some of the supposed factors have been tested 
sufficiently to eliminate them. 
F. J. Se.wer. 
Ridgway’s New Color Guide' 
A new color guide by Dr. Robert Ridgway, the well-known 
ornithologist, is practically an entirely revised and much en- 
larged edition of his earlier nomenclature of colors (1886) with 
17 plates and 186 colors as against 53 plates and 1,115 colors in 
the present work. The color work was done by A. Hoen & Co., 
of Baltimore, and is much more uniform in different copies than 
in the earlier edition, which was hand stenciled from several mix- 
ings of the same color ; while in the present work each color for 
the whole edition of 5,000 copies was prepared from one lot of 
color and uniformly coated at one time. While the present work 
does not contain quite as many colors as are included in the more 
bulky French work by Rene Oberthur, the gradation between 
colors is more uniform, and the colors are on dull instead of 
glossy-surfaced paper as in that work, which gives a slightly dif- 
ferent, but more natural color effect, and no metallic color effects 
are included. The proportion of darker broken colors is greater, 
which will appeal especially to the ornithologist and mammologist, 
although the work is designed to be equally useful to botanists, 
florists, artists, dyers, merchants, and chemists who require a 
standard color scheme. The colors have evidently been standard- 
ized to a degree of accuracy not hitherto attained in any color 
chart. The colors are one-half by one inch, arranged on a heavy 
gray paper in three vertical columns of 7 colors each. The plates 
are divided into 6 series. In plates I-XII the middle row of hori- 
zontal colors represents the 36 colors and hues most readily dis- 
tinguished in the spectrum, although it is said to be possible to 
distinguish 1,000. Above these colors each succeeding horizontal 
row of colors is the spectrum color mixed with 9.5 ; 22.5 ; and 45 
per cent, of white. Below they are mixed with 45 ; 70.5 and 87.5 
per cent, of black. Plates XIII-XX^^I represent the colors in 
' Color Standards and Color Nomenclature. By Robert Ridgway [3447 
Oakwood Terrace, N.W.], Washington. Published by the author 1912. Pp. 
1-44 ; pis. I-LIII. $8.00. 
