REVIEWS—-THE APPLICATION OF TRIGONOMETRY. - 301 
name of its author is a sufficient guarantee that the work has been 
well performed. Although various treatises on Chemical Analysis 
exist, many of these are too extensive for general use, and others are 
not readily procurable in this country ; and thus, Professor Croft’s 
very excellent manual will supply the Canadian student with a long- 
felt want. The work is divided into four sections. The first treats 
of apparatus and reagents; the second gives the reactions of the 
more common bases and acids, with tables for the detection of these 
bodies ; the third comprises the detection of poisons, both mineral 
and vegetable ; and the fourth includes special directions on alkali- 
metry and acidimetry, the analysis of soils and mineral waters, tne 
examination of bile and urinary calculi, and other matters. The 
work is thus not only adapted to the requirements of our University 
and other general students; but, to the medical student, also, it 
will prove equally acceptable. Ee J.C, 
Examples of the Application of Trigonometry to Crystallographic 
* Calculations, drawn up for the use of Students in the University of 
Toronto. By H. J. Chapman, Professor in University College ; 
late Professor in University College, London. Toronto: Printed 
by Lovell & Gibson, Yonge Street, 1860. 
The University of Toronto having adopted the ‘“‘ Application of 
Trigonometry to Crystallographic Computations” as one of the 
honor subjects for students of the fourth year, the graduated series 
of examples, given with some introductory matter in the present 
pamphlet, has been drawn up to convey a general idea of the princi- 
ples involved in this application. 
The examples are illustrated by five lithographed plates, containing 
various original diagrams, designed expressly for this memoir. 
Amongst others, two new projections are given, shewing, at a glance, 
the relative positions of the forms of the Trimetric System of 
Crystallization—to which group, as that best adapted to exhibit the 
nature of crystallographic calculations in general, the examples are 
chiefly confined. This method of projection may be applied equally 
to all the other systems ; and its employment by the student will be 
found, it is thought, of much advantage, in fixing in the memory the 
form-relations of the different crystal groups. The Notation employed 
