Organic Bodies containing Metals. 241 



connected with the receiver B by the doubly perforated cork c, 

 which also contains the small tube b, open at both ends. The 

 receiver B is drawn out at / until its internal diameter is dimi- 

 nished to about g^jth of an inch, and this drawn out extremity 

 is connected, by means of a caoutchouc joint, with the chloride 

 of calcium tube C, which at its opposite extremity is in con- 

 nexion with a hydrogen gas apparatus D. d, e are two small 

 glass bulbs for preserving the condensed liquid. The apparatus 

 being thus arranged, hydrogen is evolved in D, and becoming 

 perfectly desiccated in passing through the chloride of calcium 

 tube C, enters the receiver B at /, expelling the atmospheric air 

 through the tube b. When the gas has thus streamed through 

 the apparatus for at least a quarter of an hour, and every trace 

 of air has been expelled from B and from the bulbs d, e by dif- 

 fusion, the extremity of the tube b is hermetically sealed, at the 

 same moment that the evolution of gas from D is interrupted. 

 The drawn out extremity of the receiver B being then quickly 

 sealed at/; B, d and e remain filled with pure dry hydrogen, and 

 A with a mixture of gases free from oxygen, as any trace of this 

 element, which might have penetrated there, would be instan- 

 taneously absorbed by its contents. B is then immersed to its 

 neck in cold water, and a gentle heat cautiously applied to the 

 whole length of A by means of a spirit-lamp. The mobile fluid 

 in A soon enters into ebullition, and distils over into the receiver 

 B j as soon as the distillation is finished and A become cold, its 

 capillary extremity is fused off at a by means of a blowpipe, a 

 remaining hermetically sealed. The receiver B is then removed 

 from the water and dried ; heat is applied to the side adjacent 

 to the bulbs d, e, so as to expel a portion of the enclosed gas 

 from their open ends at /; on subsequent cooling, a certain 

 quantity of the liquid rises into these bulbs, which are alternately 

 heated and cooled, until every trace of the liquid has not only 

 entered them but passed entirely into their expanded portion, so 

 as to leave the capillary limbs filled with hydrogen. It is of 

 importance that the whole of the liquid should be forced to enter 

 these bulbs, otherwise, on subsequently opening the mouth of 

 the receiver, it inflames, causing the expulsion of the liquid from 

 the bulbs, and thus rendering the experiment abortive. The 

 cork c is then removed, and the bulbs d, e extracted as quickly 

 as possible, the open capillary extremities being immediately 

 sealed before the blowpipe. The bulbs, having been previously 

 weighed, the increase denotes the weight of the included Hquid. 

 The residue in A was found scarcely to efi'ervesce witK water, 

 and consisted of iodide of zinc mixed with the excess of metallic 

 zinc employed. 



I have fixed the composition of the Hquid obtained as above 



