1866. | Chemistry. 403 
A_new edition of Bowman’s ‘Practical Chemistry,’ edited by 
Mr. Bloxam, has been issued. In this edition the editor has 
omitted the symbols and equations ; but at the same time he has 
contributed considerably to the practical value of the work by re- 
arranging and adding to the analytical part. 
A ‘Report of the Proceedings of the Chemical Department of the 
Highland and Agricultural Society of Scotland, made by the 
chemist to the Society, Dr. Anderson, deserves the attention of 
agricultural chemists. In it Dr. Anderson shows, in opposition to 
Liebig, that the manurial value of uric acid is quite equal to that of 
the other nitrogenized ingredients of Peruvian guano. There is also 
a very useful paper “On the Growth of the Bean Plant,” and 
another “On the Adulteration of Oil-cake.” 
PROCEEDINGS OF THE CHEMICAL SOCIETY. 
On March 1, Professor Church made a communication “On 
New and Rare Cornish Minerals;” and Mr. J. A. R. Newlands 
read a paper, entitled “The Law of Octaves, and the Causes of 
Numerical Relations among the Atomic Weights.” 
Professor Wanklyn described “A New Method of Forming 
Organo-metallic Bodies.” A paper, by Mr. C. Wright, “On the 
Action of Sunlight upon Sensitive Photographic Papers,” was also 
read. The author has made an extensive series of experiments in 
order to determine the relative sensitiveness of paper prepared with 
different reagents. His practical results are given in the following 
table :-— 
Paper prepared with Chloride of Silver . : . 1-000 
35 Chloriodide of Silver . = on O78 
“ Chlorobromide of Silver . - 4:022 
5 Bromide of Silver . > 25396 
Rs Bromiodide of Silver . F - 4°060 
On March 25, Dr. Hugo Miller read a paper “On Hydro- 
eyan-Rosaniline.” When aqueous solutions of a salt of rosaniline 
and of cyanide of potassium are mixed, the red colour of the rosani- 
line salt is destroyed, and a white precipitate of the compound above- 
named is formed. ‘The production of this compound affords, the 
author believes, the means of determining the commercial value of 
samples of rosaniline, the crystallization of which, he has found, to 
be no proof of purity. 
At the same meeting, Dr. Frankland gave an account of 
“ Metropolis Waters during the years 1865-66,” founded upon the 
results of his monthly analyses. This, with a very useful account 
of the analytical methods adopted, will be found in the ‘ Journal of 
the Chemical Society,’ for June, 1866. 
At the next meeting, on April 5, Mr. J. Spiller read a paper 
