S50 
Analysis of Vol. X. Part 1. of the 
some of the most remarkable rocks containing green diallage^ 
and an account of cleavable varieties of Saussurite, and of crys- 
tals of Serpentine. 
10. Investigation qf Formulce for finding the Logarithms of 
Trigonometrical Quantities from one another. By Wil- 
liam Wallace, F. B. S. Fdin. and Professor of Mathema- 
tics in the University of Edinburgh. — P. 148-167. 
11. A proposed Improvement In the Solution qf a Case In Plane 
Trigonometry. By William Wallace, F. R. S. Edin.. 
and Professor of Mathematics in the University of Edin- 
burgh.— P, 168-170. 
In the first of these papers. Professor Wallace has investiga- 
ted ruks for deducing the logarithms of trigonometrical func- 
tions from one another. Although the formulas are only ap- 
proximative, yet they are sufficiently accurate, and are, from 
their nature, well adapted to logarithmic^calculation. These for- 
mulae, which are highly useful, are not only new, but are cha- 
racterised by their simplicity and compactness. 
The second paper describes an improved method of solving 
the case in plane trigonometry, where two sides and the included 
angle are given to find the third side. 
12. Some Notices concerning the Plants of various Farts of 
Indla^ and concerning the Sanscrlta Names qf those Re- 
gions, By Francis Hamilton, M. D. F.R.S. & F.A.S. 
Lond. & Edin.— P. 171. 
This interesting paper contains an account of Dr Francis 
Hamilton’s botanical tour in India. The object of the paper is 
to put upon record an account of the opportunities which he 
enjoyed of making observations on the botany of India, during^ 
his residence in that country, with the view of explaining to the 
botanist where he may find the various collections which he 
made in different districts. The botanical observations which 
©ur author made in India will immediately appear. The paper 
h illustrated with a map of India according to the ancient divi- 
sions used in the Sanscrita language. 
