76 1.8.C. Proceedings of the Ninth [N.S., XVIII, 
Samples were taken systematically from the largest efflorescent area 
observed from the r re viz. an area which ora — thirty 
miles along the E.JI. Railway south of Etawah. Thes mples were 
analysed and showed considerable variations in cormpesition, the average 
being about 5 per cent of sol ect salts in Paes first inch of soils and a 
ratio of 2 : 1 between Sertonete & ulpha 
It was estimated t. -e this one ae ache supply 37,000 tons of soda 
ash per annum and the total province five m illio 
The soluble salts soutaie ed in these reh deposits a are chiefly sodium 
carbonate and sodium sulphate with some organic matter. 
Experime nits are © dese cribed to show to what extent it is possible and 
might be profita 
(1) oe obtain suites carbonate (of Sg degree of purity demanded 
the trade) by recrystallisatio 
(2) To. ‘obtain a better separatio sags passing in carbondioxide to 
t the carbonate into tioustbeans te 
(3) To. convert —_ salts completely into carbonate by the black 
ash 
(4) To convert “the salts completely into carbonate by a modification 
he black-ash process (omitting calcium carbonate). 
The manufacture of trinitrotoluene from Assam and 
Burma petroleum.— By E. R. Watson 
Both Assam and Burma petroleums contain a considerable quantity 
of aromatic hhydroea eit ns. 
Processes king trinitrotoluene from these petroleums are 
ng in indian Patanis Nos. 6802 and 7449 of 1921. 
mportance pe meee 2 secon lies in the — rte they put 
India in’ a position nufacture all her explosives 
from materials pect ee tr in oie vithout part at: for the » developement 
of a large coal-tar and coking bye-product in 
oratory experiments are now des ecthed show ing that no larger 
quantities of acids are “i gies for the manufacture of trinitrotoluene 
by ig B atgeees than in the ord ery process, a the process 1s no 
being tried on a se sor a scale at the Government explosives factory 
at Aravekaaie: South India 
Phototropy of inorganic salts.— By GopaL SINGH. 
Cuprous riage and bromide in presence of water, have yore 
found to be phototropic. An attempt has been made to explain this 
phibtdtropienn: 
wascairsit ate catalysis.—By A. K. SANYAL. 
Ferr rric, ag HPC chromium, and cobalt are positive 
catalysts persia chlorine, bromine and sodium sulphite have been 
und t Spee 
O4; 
Goce: (1) HgC, and (NH,), C,0,; (2) CuSO, and (NH4), C2 
) BON) and (NH,)p C07 (4), (NH) 00, and Ip; (6) ‘Febling® 
soluti 
eiahdy iach _ of lead and bismuth were exposed t i. ben 
sunlight and rved that in general the freshly precipitated “< 
ones were ten pat repented active than those which h 
kept for a long time or have been boiled for a long time. 
South Indian Wattles.— By C. Sxtntvasan. 
The paper summarises the results of an investigation of the arr 
content, optimum temperature of extraction and tanning prem 

