1919.] The Sixth Indian Science Congress. CXXXV 
eeity of this theory, several series of new compounds have: been ex- 
ned; it is found that in no case is Frankland’s pil sade out by Deine 
omie Ss. 
The effect of conjugation on rotatory power is also studied. 
Salts of porphyroxin.—By J. N. wining hick 
An alkaloid, laa acne has been state of purity from 
Indian opium and its hydrochloride, chloroplatinto, hydrobromide, hy- 
droiodide, sulphate, phosphate, nitrate, acetate xalate, tb Tat ‘aieabe: 
and picrate have been prepared and their piaper tisk studie 
The resolution of the systems: nitric acid—sulphuric acid 
—water and nitric acid—water on an industrial scale.— 
G. 8. BUTLER. 
The crear etnias considerations underlying pee resolution are briefly 
outlined. A description is given of the manufac fend processes hitherto 
used for effectin 2 this resolution, followed by an unt of an experi- 
mental investigation into the processes both in the laborateey and on the 
large scale. The outs aceaat a of the —— si oer are pointed out 
: ; afin 
n of y an 
experimental re: a reser guided the pao in designing an improved 
process and plan An account follows of extensive experiments on a 
Seragueatastibineg poset re) parvereh the conclusions petewan arrived at and 
leading up to the design of a large scale industrial plan 
An improved process and apparatus for obtaining on an 
industrial scale concentrated nitric acid from liquors in 
Mate red acid is present together with water.— By G.S. 
Ru TL 
: ign 
working of the ae and pinta are ba upon the nrjaepies es- 
tablished in the a s S first pene The process is a continuous one an 
ing the concentration of sulphuric acid in the plant gf by t 
wg and the separation of nitric acid from very weak aqueous shod 
tio 
The diazo-transformations of amino-coumarins.—By B. B. 
ev and H. Dalal. 
In course of an ee. be the orientation of the halogen 
atoms in Bani ated and brominated coumarins, several chloro-, bromo-, 
o-, and cyano-coumarins ‘iste ve sw pei red by the diazo-reaction from 
different sriciasrocmaadinl ana amino- Lope Ae nly a few 
of these are known, having been synthesised from the corresponding 
salicylaldehydes by the Pe ik reaction; the yield obtained, however, 
— very _. hardly re 3 per cent of the possible. The pr 
ribed in paper serves as an excellent method of pbtansnas good 
Haide of the asad in a piren of purity. 
A theory of valency based on the Ss la of organic 
compounds of the elements. ——By 
