transactions of the sections. 
45 
tive, and that for chabasie positive, and from certain crystals of 
chabasie including an excess of silica, which is a substance plesio- 
morphous with chabasie. (Dr. Thomson stated that there are 
two distinct species of chabasie, one of which includes soda and 
the other lime, and from the admixture of which the phenomena 
might perhaps arise.) 
Professor Johnston stated verbally the results of his analysis of 
the single and double iodides of gold, results which he found to 
correspond generally with those already obtained for the chloride. 
1 r,m *>**"*■««? > 
Professor Graham gave an account of some recent researches 
which he has published in reference to the constitution of certain 
compounds as far as respects their constituent water. He illus¬ 
trated his views by sulphuric acid, with 1 and 2 atoms of water, 
by oxalic acid with 1 and 3 atoms of water, and by nitric acid 
containing 1 and 4 atoms of water. Other compounds were also 
adduced, such as oxalate of magnesia, which contains two atoms of 
water, or that which may be considered as the water of crystalliza¬ 
tion of oxalic acid. The oxalate, binoxalate, and quadroxalate of 
potash, and several other saline compounds were also brought for¬ 
ward in explanation of his view’s, 
• • • 
Anhyd. oxal. a.. (C + C) 
Oxal. water.... (C + C) H 
Oxal. acid. H(C+C)2H 
Oxal. potash. .. K (C C) H 
Binox. pot.K (C + C) H + (C + C) 2 H® 
Quadrox. pot... K. (C + C) H + (C + C) 2 H + H (C + C) H 2 
He then drew attention to ammonia, which he considered as fre¬ 
quently performing the function of water in saline compounds; a 
view which he impressed upon the Section by drawing attention to 
the composition of the sulphate and of two distinct ammoniurets of 
copper. 
On a new Method of testing the presence of Muriatic Acid in Hydro• 
cyanic Acid. By Professor Geoghegan. 
This proceeding is essentially preliminary to the adoption of the 
usual modes of determining the strength of any given specimen of 
this agent. The insoluble compounds into which the chlorine of 
muriatic acid enters, and by the formation of which chemists usually 
recognise its presence, are known to resemble, in many respects. 
