OF ARTS AND SCIENCES. 359 



often can be freed from them by washing with ether. The substance 

 dried at 100° gave the following results on analysis. 



I. 0.2984 grm. gave after decomposition by boiling with a solution of 

 potassic hydrate 0.3488 grm. of argentic chloride. 

 II. 0.1300 grm. treated in the same way gave 0.1530 grm, of argentic 

 chloride. 

 III. 0.2374 grm. gave after decomposition with a boiling solution of 

 pure sodic carbonate 0.2718 grm. of argentic chloride. 



Chlorine 



Properties. — The benzoltrisulphochloride crystallizes from chloro- 

 form in Httle silky flattened needles, which under the microscope are 

 seen to have the ends bevelled, or occasionally terminated by two 

 planes forming an obtuse angle ; frequently groups are observed 

 made up of a number of needles united longitudinally, giving a char- 

 acteristic comb-like appearance to the ends. Out of benzol it forms 

 good-sized plates, apparently belonging to the triclinic system. It melts 

 at 184° (uncorr.), and sublimes with some difficulty at temperatures 

 above 200°, forming good-sized flattened needles similar in shape to 

 the crystals from benzol. It is insoluble in water, hot or cold, but is 

 slowly decomposed and dissolved when boiled with it; very slightly 

 soluble in cold alcohol, or methyl alcohol, but freely dissolved with 

 decomposition when boiled with them, very slightly soluble in ligroine, 

 slightly soluble in ether, freely in benzol, carbonic disulphide, glacial 

 acetic acid, or chloroform. Chloroform is the best solvent for it, as it 

 is much more soluble in it when hot than when cold. As already 

 mentioned, the chloride is slowly converted into the acid by boiling 

 water, and is much more easily attacked in this way than the benzol- 

 metadisuliihochloride, so that the acid can be prepared conveniently 

 by heating it with water in open vessels, whereas with the di com- 

 pound this reaction does not take place readily at temperatures below 

 140°. With boiling alcohol the product is also the acid ; but this point 

 will be discussed more fully under the ester. Solutions of potassic 

 hydrate or carbonate, or a mixture of argentic oxide and water, when 

 boiled with the chloride, convert it quickly and easily into the corre- 

 sponding salt. The study of the action of reducing agents on the 

 chloride will be reserved for a future paper. 



* The potassic hydrate used in I. and II. was not perfectly free from potassic 

 chloride. 



