TKANSAOTIONS OF THE SECTIONS. 63 



Ist. It affords a ready method of detecting and separating extraneous matter, 

 such as gi'it, sand, shreds of canvas, or splinters of wood, all of which are liable to 

 occur even in good anthracene. 



2nd. The preliminary washing produces a dry powder of perfect uniformity, from 

 which it is easy to weigh out a small quantity. 



3rd. The preliminary washing removes, beside others, the greater part of two 

 important impurities, one of which, viz. paraffin, defies the kinone test, and the 

 other, viz. phenauthrene, is not, if present in large quantities, completely oxidized 

 under a considerable time. 



4th. By removing a large proportion of the impurity beforehand the oxidation 

 proceeds more quietly, and the kinone obtained is more crj'stalline and freer from 

 chromium compounds. 



On some Instruments used in the ' Challenger J By J. Y. Buchanan. 



On Ammonia Seleniocyanide. By Dr. Cameron. 



On a Gas-condensing Machine for the Liquefaction of Gases by combined cold 

 and pressure, recently employed in the manufacture of Volatile Liquid Hy- 

 drocarbons. By J. S. Coleman, F. G.S. 



This paper gives a resume of the author's paper on the effects of pressure and 

 cold upon the gaseous products of the distillation of shales^ read to the Chemical 

 Society, September 1875. 



It then enters into certain thermodynamical questions relating to the best method 

 of obtaining cold from a compressed gas, so as to utilize the cold produced in ex- 

 pansion, to supplement the effect produced by simple pressure. 



It then describes the engineering arrangements finally adopted for dealing with 

 250,000 feet of gas daily at the works of Messrs. Young & Co., on the principle of 

 the drawing exhibited. The diagrams used were enlargements of the actual draw- 

 ings of the machine as erected, and showed all the precautions found necessary 

 in actual construction. The working of the machine, which gives, as a maximum, 

 2000 gallons per week, during the last thi'ee months was described, and samples 

 of the product exhibited burning in Laidlaw's air-gas apparatus. 



Experimental Eesearches on the Chemical Treatment of Town Excretion, 

 By J. S. Coleman, F.CS. 



On the Transformation of Chinoline into Aniline. By Prof. Dewae, F.E.S.E, 



On the Proximate Analysis of Coal-Gas. — Remarks on JRehouVs Paper on 

 Pyro-Turtaric Acid. By W. Dittmak. 



Oh an Apparatus for the Analysis of Impurities in the Atmosphere. 



By E. M. Dixon. 



On Fire-Briclc. By J. Dtjnnachie. 



On White-Lead. By A. Fergusson. 



6* 



