208 
ORIGINAL COMMUNICATIONS. 
but when heated strongly, takes fire, and leaves a white alka- 
line residue. Its composition is expressed by the formula 
(2S0 3 + C 6 H 6 2 ) + CaO. 
Sulpho-mesitylate of lime is similar to the former; the 
formula of its composition is (S0 3 -f C 6 H 5 0) + CaO. 
Persulpho-mesitylate of baryta crystallizes in small pearly 
plates; when heated, becomes brown, chars, and sulphate of 
baryta is left; its formula is (2SO-f C 6 H 5 0) +BaO + HO. 
Sulpho-mesitylate of baryta could not be isolated, and the 
sulpho-mesitylates of lead were not examined. 
With the acids of phosphorus, two new acids were obtained, 
viz., the hypophospho-mesitylic, and the phospho-mesitylic 
acid. The hypophospho-mesitylic acid is formed by acting 
on mesitic alcohol by phosphorus and iodine, in the mode 
directed for the formation of iodide of mesityl. After the 
distillation of the iodide, there remains in the retort white 
amianthine crystals. These are soluble in water, affording a 
colorless liquid of a strongly acid and intensely bitter taste; 
neutralized by baryta, it yields an insoluble phosphate of 
baryta, and a soluble white salt. This solution, evaporated to 
dryness, concretes when cool; when the mass is to be boiled 
in strong alcohol, to dissolve out iodide of barium, until no 
trace of iodine remains. It is thus rendered pure, and remains 
as a white crystalline mass, neutral to test paper, and when 
heated, takes fire, giving off copious fumes of phosphoric 
acid. 
Its composition is represented by the following formula, 
2P 2 O.BaO-j-C 6 H 5 0-f HO, containing one equivalent of water, 
from which it cannot be separated without decomposition. 
Phospho-mesitylic acid is generated by the action of pure 
glacial phosphoric acid, upon mesitic alcohol. During this 
action heat is evolved, and the mixture becomes brown. On 
neutralizing the solution with soda, a liquid was obtained, 
which yielded, on evaporation, phospho-mesitylate of soda. 
This salt crystallizes in rhomboidal plates, which, on expo- 
sure, becomes opaque. On being heated, it melts in its water 
of crystallization, and, by the loss of this water, becomes a 
