1922.] Indian Science Congress. 1.8.0. 77 
of he — of ie Acacia Decurrens found in South India, indicates 
how nnin content varies with age and discusses the question of 
the aes Tcteast Industry in relation to Wood Distillation in South 
India 
A note on some tartrates.—By K. P. CHATTERJEE. 
my Beant: investigation on the influence of temperature on 
iaieipitadlen by double decomposition, gee en strong plate are 
mixed, the following are some of the new tartrates obtaine 
(1) Two varieties of regents tartrate of the pe, Co(CgH140,), 
, and also the anhydrous salt Co(CyHyO,): (2) m 
nesium ‘eetentn MgC, 4 4), 23H,O and also the anhydrous 
salt ; anganese tartrat n( 40s), 2He t 
nhydro (4) complex copper potassium tartrate 
30u,C,H,O4), TCH 40g), 3H,0 and the anhydrous salt; (5) 
strontium tartrate Sr(C,H,O,),H,O and the anhydrous salt. 
The formulae of these salts have been determined by of 
methods and the properties have been studied. Their ‘acleeuler volumes 
have also been determined, in which a general confirmation of the 
accepted molecular volume of water a crystallisation, has been 
obtained. 
ages beet dace on indigo Se tbedree poo vat textile 
—By N. A. Ya D. R. Sarna. 
JNIK @ 
1. It was found by obeys! avetgnton that pure indigotine, the 
Sy ang pepe sats oe atter ral and synthetic indigo, extracted 
after neko: sa be Pat reduced, with N.F. hydrosulphite, 
in an per met, = = pasieeaties of 60° to 80°C, and in the pro- 
portion of 1: 
fibres, i.e > did deep s 
3. The presence of eeey small amouats of boric acid, acetic acid, etc., 
was found to increase the maximum shade, keeping all the factors the same. 
The nature of thé re meeag involved is not underst sea at present but the 
additions to the vat are phe recommended owin, 
(t) Control of over 
(it) The chances of 
of ave. i.e. maximum shade obtained 
east amount of indigotine. 
The whole pr pete rests on finding out the a of over-reduc- 
tion and be condition sand nature of collulose in the v 
ture of Portland 
Laboratory experimen nts on the manufac 
cement from ties available in the United Prov. YG. 
_ E. B. Warson, K. ©. Muxkersee and N. G. 
y ~ 
CHATTERJEE. 
_ Chemical analysis indica 
ing in the United Provinces are (dl 
igh percentage of calcium carbonate ; 
magnesia in many materials. 
mak- 
the chief drawbacks for ce ment 
a ou) deficiency of material containing & 
12) too high # perce ntage of 
