298 



THE ALLOTROPISM OF CHLORINE. [MEMOIR XX. 



Fig. 41. 



eter perforated through it. This hole was 

 not in the centre of the glass, but towards 

 one side, as shown in the figure. The interior 



/ O 



of the tube was perfectly clean and dry. 



A second tube, B, consisting, as shown in 

 Fig. 47, of two portions; a wide portion, B, 

 and a narrower tube, <?, was cemented on an- 

 other piece of ground plate -glass, similar to 

 the foregoing in all respects. The tube c 

 was open at its lower extremity, and the entire capacity 

 of B and c conjointly was adjusted so as to be equal to 

 the capacity of A. 



Next I filled A with dry chlorine, and B c with dry 

 hydrogen, and kept them from mixing until the proper 

 time by operating in the following way: I 

 placed the ground glasses face to face, as 

 shown in Fig. 48, with a small quantity of 

 soft tallow between them, arranging them 



O O 



in such a way that the aperture which led 

 to the interior of A was open. 



Through this aperture dry chlorine was 

 conveyed. It was generated by a mixture 

 of peroxide of manganese and hydrochloric 

 acid in the flask D, Fig. 49, and passed along a tube, E, 

 filled with chloride of calcium. A slender glass tube,/, 



conveyed it to the bottom of 

 A, which was then filled by 

 displacing the atmospheric 

 air. When A was supposed 

 to be full of chlorine, it was 

 slowly lowered so as to bring 

 the tube out of the aperture, 

 and as soon as it was disen- 

 gaged the glass plates were 

 Fig. 49. moved in such a manner by 



