1886. | Recent Literature. 359 
felted saddle in which the basioccipital 
rests, which branches curve upwards and 
press against the bases of the rear horn- Hg 7 
cores, so-called, and hold all firmly in ; 
place. The front iron has a small square 
button on top, felted, on which the roof 
of the mouth rests. These irons weigh 
four pounds, 
While it is of course impossible to fix 
amaximum for the size of pedestals, a 
minimum is a good thing to have, and I X 
have fixed on 3 in. x 114 in. x I in. high. 
This gives room for a good sized label 
on the side, giving genus and species, 
geological formation, locality and cata- 
logue number. 
For very small jaws, single small teeth, &c., I set up a small 
cylinder of plaster on one of the smallest pedestals, 
and cement the specimen to the top of it. In other 
cases, as in Didelphys pygmea Scott, and the Acip- 
tion jaws shown in Fig. 8, the slab of matrix is 
cemented to the surface of a board hung on two Fig: 5 
Pivots, so that it can be tilted to either side for ex- 3 Roars 
examination. And when a new specimen shows 
new features I devise a new mounting to suit them. 
:0: 
RECENT LITERATURE. 
CROLL’S CLIMATE AND Cosmo.ocy..—In this volume of essays, 
Mr. Croll reaffirms his physical theory to account for the glacial 
climate in a way to command the attention of every geologist and 
in a manner which will attract the interest of the lay reader. The 
discussions relate to questions of the deepest interest, and the 
arguments used are certainly strong ones. Mr. Croll’s peculiar 
views as to the existence of glacial climates before the Quater- 
nary period are restated with much fullness, though he candidly ie x 
admits that most geologists are opposed to them. 4 
bi € author’s theory is usually called the “eccentricity theory,” _ 
ut he prefers t#call it the “ physical theory.” He states thata 
h state of eccentricity of the earth’s orbits will not necessarily a 
* Discussions on Climate and Cosmolo, B -DF R.S. Sia 
. By James CROLL, LL.D., F.R.S. N i 
ork, D, Appleton & Co., 1886. ee pp. 327. $2. i i Soe 
