190 a Bibliography. 
enlarged philosophical views, with respect to the extraordinary creatures 
which Dr..Mantell has rescued from the darkness of ages, and restored 
to their proper position in the creation. Those who would know the full 
bearing of the facts, especially those regarding the extinct saurians, 
must peruse the larger works of the author, his Tilgate Forest, his 
Geology of the Southeast of England, and his Wonders of Geology. 
We are truly sorry to have him terminate his memoir on the Iguanodon, 
by adopting the words of Cuvier: “Je termine ici mes travaux, etje | 
laisse 4 mes successeurs a cultiver un champ que je n’ai fait. qu’ouvrir 
et qui bien certainement leur donnera encore des moissons plus the 
que toutes celles que j’ai pu recueiller,’’* fhe: 
7. Treatise on Algebra; by Tuomas Suerwin, Principal , of the 
English High School, Boston. (Communicated. )—Among the publi- 
cations designed for the instruction of youth, which are daily issuing 
from the press, our attention has been recently directed to the elemen- 
tary work named above. We think this wo cannot fail to find its 
way to the favor of all who give it a careful perusal. The author, in 
his preface, modestly acknowledges his indebtedness to several prece- 
ding works of the kind, particularly that of Colburn, the favorite of the 
Massachusetts school-room, which, however, it surpasses in the num- 
ber of examples for practice. These are so numerous, and so well 
chosen, that we are confident that a careful and correct. solution. of 
them will secure to the student something beyond a merely. superficial 
knowledge of the subject. In the earlier part of the work, we were 
particularly pleased with several sections. One on the subtraction of 
negative quantities, which we remember in our school days was consid- 
ered a most intricate subject ; another on the ‘‘ greatest common diyir 
sor,” the reasons of which are seen in the school arithmetics as through 
a glass darkly ; and a third on generalization, then held in almost. rey- 
erential awe. Of the more advanced sections, we were pleased with 
__those on negative exponents, and the unusually numerous examples in 
this department, will be found very useful. We were. interested with 
the section on inequalities, and with that on ratios, of which Colburn 
and some other writers say noth ~ The section on logarithms,. withe 
out susring on the tedious calculatio 
