Ad 
and the persulphomesitylate of lime 
2so0, +c, H, 0-+2ca 0+ HO. 
When an excess of phosphorus is used in the process 
for making iodide of mesityl, there is obtained in the retort 
a white matter in silky crystals, which dissolves in water, is 
very acid, and forms well characterized salts, which, when 
heated, take fire and burn with a well marked flame of phos- 
phorus. This acid is termed hypophosphomesitylous acid ; 
and the formula of the hypophosphomesitylate of baryta is 
P,0+C,H,O+8Ba0-+H0. 
In the decomposition of mesitic alcohol by perchloride 
of phosphorus there is obtained an acid which gives a soda 
salt crystallizing in rhombs which contain water of crystal- 
lization. Their formula is 
P, 0, +Na0+C, H, 0+ 6HO. 
Professor Kane stated that he had obtained also thé aldehyd 
of the mesityl series, as well as bodies procured by the action 
of chlorine and iodine on mesitylene, and the acids which 
are generated by the oxidation of mesitic alcohol, the history 
of which bodies shall form the subject of another paper. 
The empyreumatic oil, which is produced in small quan- 
tity when mesitic alcohol is prepared by distilling acetate of 
lime, has been submitted to analysis by Professor Kane, and 
its composition found to be c,,H, 0. It therefore belongs to 
the family of which oil of turpentine is the base, and is po- 
lymeric with camphor, and the pinic, sylvic, and copaivic 
acids.* 
Dr. Apjohn read a paper “ On the Specific Heats of the 
Aeriform Fluids.” 
The first part of this communication was an analysis of, 
and some critical remarks upon, the labours of those who 
* In this abstract the atomic weights are taken, Hydrogen = 1. Oxygen =8. 
Carbon = 6, 13. 
