NOTICES OF SCIENTIFIC MEMOIRS 
185 
plates, many of which are colored, covers the Saturnioid moths, including 
many species of large size, important as producers of silks, and others injurious 
to cultivated plants. This does not complete the work planned by Dr. Pack- 
ard, but includes all the material which was sufficiently elaborated at the 
time of his death to be available for publication. As the work developed under 
Dr. Packard's hands, it became increasingly apparent to him that for a broad 
and philosophical view of the subject it was necessary to take into account the 
exotic genera and species, and thus the later work is of larger scope than the 
original title {Bombycine Moths of North America) would suggest. The work 
on the Saturniidae was, in fact, planned on the lines of a monograph of the 
species of the entire work, with special reference to the transformations, in- 
cluding elaborate new descriptions of all the larvae which could be obtained 
from any source. The editor found it impracticable to bring the work up to 
date, to include all known species, and sought only to include some account of 
lately discovered genera, and to elaborate somewhat more fully the part 
dealing with North American species. To do more than this would be to 
unduly increase the size of the volume without corresponding advantages, 
especially since the added matter would represent merely the republication 
of descriptions which have already been printed elsewhere. To do less would 
inconvenience the user of the book, who would look in it for up-to-date in- 
formation, so far as the plan of the work might lead him to expect. The final 
result is necessarily imperfect and suffers greatly from the lack of the de- 
velopment and revision the work would have received at the hands of the 
illustrious author, had he lived; but on the other hand it represents a large 
positive contribution to entomology, especially on account of its numerous new 
and detailed descriptions, and the beautiful new illustrations of larvae. 
Dr. Packard left comparatively few illustrations of the adult insects, and 
the absence of pictures of most of the genera discussed was felt to be a serious 
drawback. Fortunately this difficulty was overcome through the generosity 
of Mr. J. H. Watson of England, and of the U. S. National Museum, through 
Dr. H. G. Dyar, and so the published work contains figures, made from photo- 
graphs, of a very large number of species, many of which are represented by 
the actual types, while many others are here figured for the first time. 
The work here concluded is a continuation of previous investigations pub- 
Ushed as Volume 7, First Memoir, and Volume 9, Second Memoir, of the 
Memoirs of the National Academy of Sciences. 
The Turquois: A Study of its History ^ Mineralogy, Geology, Ethnology, Archae- 
ology, Mythology, Folk-lore, and Technology. By Joseph E. Pogue. 
Third Memoir of Volume 12 of the Memoirs of the National Academy of 
Sciences. Washington, 1915. 
This treatise contains 206 pages and is illustrated by 20 half-tone plates, 
2 colored plates, and 6 text-figures. It is concerned with the treatment of 
