exxii Proceedings of the Asiatic Soc. of Bengal. [N.S., XVII, 
taken up with advantage by = ie Prd colleges in India for inter 
ct mira supply, and that the s thus effected might be utilized 
profitably in importing oc fi precision only from abroad. A 
description and sketches of the following instruments are given and the 
instruments themselves exhibited :— 
— 
A eat ste ais model ene the formation of images by 
reflection from a plane 
A mechanical mode! for verinaation of the law of refraction, 
ew mercury reversing key. 
Three ‘atlatian of apparatus to bly? that pressure at any point 
rae liquid depends only on the head of the liquid. 
A model compensated pendu ee 
. demonstration apparatus ree radiation and absorptio 
modified form of Puilinger’s apparatus for finding his ex- 
pansion o — 
A modified hypsometer. 
A modified Berthelot’s apparatus for determination of the 
latent heat of steam 
et GE eR oe Be be 
Section of Chemistry. 
President :— Dr. H. E. Watson, D.Sc. 
Presidential Address. Journal Indian Institute of Science, 
Vol. IV, pp. 223-239.) 
Alcoholysis of esters of saturated and unsaturated acids. 
—By B. Dasannacuarya and J. J. Supporoven 
The authors describe experiments on the Brey rates of : cena 
of esters of certain saturated acids and the ester. of the analogous af- 
unsaturated acids using hydrogen chloride as sabat at, “The me ethod 
was @ dilatometric one and the experiments were conducted in 
at 30° 
rove that an a8 olefine linking in the acyl portion of the 
ester molecule has a retarding effect similar to that observed i in t the ¢ cata- 
lytic esterification of acids and in id 
The reactions studied w ane to 
(1) gan d butyrate + Ethyl] alcohol—»Ethyl butyrate + Methyl! 
(2) Methyl crotonate +Ethy! alcohol—»Ethyl crotonate + Methyl 
(3) Meth! B-ph so Srhdid ar +Ethyl alcohol—»Ethyl 8-phenyl- 
Se gant + Methyl aleohol. 
oe wesc chine, alcohol» Ethyl cinnamate +Methy! 
and the corresponding reverse reactions. 
ce pe compounds of meta-dinitrobenzene.—By D. D. 
Karvé and J. J. Supporovan. 
_ Sym cae cata ne forms additiv. © compounds with aroma- 
tic oe phenols, Phenolic senshi arylamine s of differe nt types 
a i be 
, ar he 
bs Pp 
— with the dinitrobenzene ; the y exception to this rule so far 
met with has been the hydroc arbon acenaphthone. Arylamines, e.g. 
