1919.] The Sixth Indian Science Congress. CXxxi 
recorded, and when we revert to normal conditions we may 
continuance of the experiments. 
Colloidal antimony preparations.—By F. L. UsHEr. 
Many attempts have been made to prepare stable sols of metallic 
antimony for medicinal use. Chemical reduction methods gave the metal 
in the form of a precipitate in i Me caves e, except at nitions too 
sat 
c 
great to be of deed ter value. By electrical dispersion gaan a 
ere obtained in me , ethyl, and nepropy oer ak and in 
methylal, and acetic aot: bu cept i of ethyl aleohol they 
very u e. Attempts to transfe he dispe: sed 
alcohol to water led to the 4 repaaly : of unstable sols. isira pe 
peeetely. charge d, sik wa idly oxidised by d sited air, and then 
coagulated owing to Acbralidation of the charge. Coagulation das took 
place when ai ea ex Sa eer 
s regards an mpo ounds, - was fesaine that Paal’s protalbic 
acid method is iapehntie we antimony, stable sol of the oxide 
could be prepared. At present sols of the aisha, of saps ioe 1 in 500, 
are used. They are very beable when protected with gum 
mie te of naphthol ethers.--By G. B. KotHaTKaR. 
Methyl ae mas A nee of 8 naphthol, ris ether of a naphthol, 
and methyl e of Seep are nydrelvie sed by . HCl on a boiling 
water! bath i in sealod ¢ tub 
ether to HCl wa ee or some Solos 
ated 
eee ig Sodantaes than the ethyl ether. The reaction being = a 0- 
geneous Bie the extent of hydrolysis depends mostly upon volume 
of = used and is only slightly affected by the amount = the ether 
t 
tai of the acid has a very aa influence on the extent of 
the feat te tach 
Condensation of benzoin with diamines.—By S. C. 
CHATTERJEE and B. N. GHos 
With the idea of preparing substituted paphiho Sipyriaiee or , Pie 
benzo 
some of the naphthyl ene diamines, using the correspon nding prin: a bedee- 
chlorides as condensing agents. Only in the case of 1-4 and 1-5 diamines, 
the reaction took place in the manner desired—a molecule of the diamine 
combining with two oe of benzoin with ‘the elimination of four 
molecules of water. There are three p ible formule for each of these 
substances ghn roof is available, on the strength 
of indirect evidence as aaee that each ‘ages 
atoms in both ao substances — part of a six-me' mteeed ring 
ontrary to expectation, t 2 diamine yield product which 
appears to be identioal with O. Posker s inmine akydronaphthoquinoxe- 
line ier, 1893, 26, 192). 
ntally, os reaction between benzoin and benzidine was also 
studied sy n this case the closing of the sine 4 gid. not take ig the 
compound o ined having the following structure 
- 
