C. U, Shepard on supposed Tadpole impressions, 99 
Bibliography. 
Traité 8 ee des haba par ot General Poncerer. 2d Pesiss 2 Bete in 
4°, avec es.—This k, which is a complete exposé of sub- 
ject, aioe em the prineipal discoveries which the illustrious wit era. maa re 
in this department of inquiry. He has been en gaged on the work since 1812, and 
pent lig sae it when taken prisoner of war in Russia on the retreat from 
cond edition, besides many aviend RE iy eX the general the- 
om oF ‘the ane ers wre armonic means ; polar reciprocity ; sis of transversals, 
and their principal application to the projective properties of pec and geometric 
surfaces. 
Cours Ga algébre Superieure, par Serrer, Membre de Sregiennt — au College de 
France, et a la Faculté des Sciences des Paris. 3d edit., 2 vols, in 8yo—The first 
many = Ne s by the author. While this learned man does not pretend that 
the work i omplete treatise upon higher algebra, it idea notwrithe tanding a 
body of data which will be of great use to those geo metricians who are en- 
| 
f=] 
oe 
a& 
&y 
bh 
an 
3 
a 
3 
[= 
2 
bed 
~ 
a 
a 
br | 
a3 
® 
i) 
rot 
: 
oS 
Le 
o 
fe) 
is] 
Fog 
we 
a 
oO 
a 
e was director. The Leong is te sag we Lae calculations are not apse 
ant discoveries as well a as distinguished nathoasntii 
Eléments de Mécanique, par Mr. Vrerie. In ‘eek de 256 pages avec figures— 
Vieille is Inspector General of the Searenity of France. This shone “of his is de- 
signed for the use of the various colleges, and is fully adapted to that 
Le Chi rm ied and to 
. 
s.—This journal appears semi-monthly, costs but 8 oye per year, and, ac-’ 
cording ie its Pos contains the novelties in Sag department of chemistry applied 
to the ch part consists of 16 pages 8 
Art. XIV.—On the supposed Tadpole nests, or imprints made by 
the Batrachoides nidificans (Hitchcock), in the red shale of the 
New Red Sendeione of South Hadley, Mass. ; by CHARLES UP- 
HAM SHE 
, Dr. Hitchcock was ‘ea to conceive of and adopt the theory of 
. poe origin first suggested and made publie by Prof. Sillimat 
_ Jr., and the late Capt. N.S. Manross, viz., that they p 
from the gyratory movements of hits ane he very cau- 
* Several ser iy photographi 1 this paper, which 
are t was impossible to do. inom jontiag sicaaeae sont 
