Geology and Natural History. 417 
trations, it is a successful eeaiaeien st of good science with 
sound rwetieal advice. It is to be hoped that the day is not far 
distant when every hétkelteeper will have the knowledge | to un- 
derstand these principles and the wisdom to apply them in all the 
omely operations which she has to direct or perform. This little 
book cannot fail to do good service in bringing about this de- 
sired end. 
II. GroLtogy anp Natura Hisrory. 
Bulletin of the I niet is State ete of Natural History 
No Fr g. 
(at Springfield. I mee ka 188 8vo. Printed 
for the Museum, 18 >This 6 rst Bulletin of the Illinois State 
cheat seamen shies articles, (i) Descriptions of 54°n 
: onif 
Tilinois aha: ek and (2) Corrections and proposed new names 
for species previously we oe d in the Geological Survey of 
Illinois under names that were preoccupied, an escriptions of 
two new species of fossil shells from the Coal Measures of Illinois 
and Kansas, by = ORTHEN, Shee: Sy and (3) 
Descriptions of two new species o noids fron Chester 
limestone and Coal Manatee of Tinos, by CHARLES ‘Wa HSMUTH. 
Mr. Worthen announces that the new species sepited by 
him will be fully illustrated in the Seventh volume of the Geologi- 
eal Survey of Illinois, now in course of preparation. <A large part 
of them are represented b specimens of unusual perfection partly 
in the State Collection, but largely in that of Mr. L. A. Cox, of 
Keokuk, Iowa. The changes of names of species in the published 
volume of the Illinois Geological Survey, given in the second 
paper by Mr. Worthen are the igre Platyostoma Gray- 
villensis in place of P. tumida, vol. ii; Modiolopsis rectiformis 
for M. orthonota, vol. iti; Mod. Cairollanns for ©. subnasuta, 
vol. iii; Platyceras subsinuosa for Pl. subundatum, vol. iii; Pleu- 
is fi Ort 
rotomaria coniformis for Pl conoideus, vol. v ; oceras Ran- 
dolphensis for O. annulo-costatum, vol. vi. A. Litho, beaeict in 
vol, iii, p. 536, is here named ZL. I Siesta 
lacial-era Climate.—M. W ox1Kor, in a paper on “ Gletscher 
und Eiszeiten in ihrem Verhaltnisse zum a,” rejects the idea 
that an epoch of maximum eccentricity with aphelion in the win- 
ter would be favorable for a glacial era. He observes that in the 
interior of Asia, for example, the greater cold in winter would not 
favor a large accumulation of snow, while the excessive heat of 
height than now. In the region of the monsoons, the cold and 
dry monsoons of the winter would have greater force than at 
ence there 
over the lands adjoining. The effects pons maximum eccentricity 
