384 MR C. G. WILLIAMS' RESEARCHES ON 



deposit of chestnut-bronm crystals takes place. This salt is moderately soluble in 

 water. It requires a very strong heat to give pure metallic palladium. 



{3-423 grains of palladiochloride of chinoline gave, on powerful ignition in a porcelain capsule, 

 •725 . . . palladium. 



or, per cent. — 



Experiment. Theory. 



(C 18 H 7 N, HCl, + PdCl 

 21-18 20-96 



Cadmium Salt Chinoline. — The experiments of Croft, and more especially Von 

 Hauer, have shown that cadmium forms well-defined crystalline salts, with the 

 chlorides of the alkalies, alkaline earths, and the chloride of ammonium. Before I 

 became acquainted with the results of the latter chemist, I had been engaged in a 

 series of experiments made with a view of extending our knowledge of the double 

 salts formed by the hydrochlorates of the alkaloids with metallic chlorides. The 

 information at present in our possession on this subject is very limited. The only 

 salts of the class alluded to which have been analysed, are those formed with pla- 

 tinum, gold, palladium, and mercury. Now the salts of the latter metal vary 

 greatly in constitution, and are, moreover, somewhat troublesome to analyse. I 

 have, therefore, made a few experiments with a view to ascertain what other 

 metals than those mentioned above, yield chlorides capable of combining with 

 the alkaloids, to form well crystallized double salts. In the present communica- 

 tion, however, I only notice those formed by the chlorides of cadmium and 

 uranyl with chinoline. 



When moderately concentrated solutions of hydrochlorate of chinoline and 

 chloride of cadmium are mixed, the fluid solidifies with rise of temperature to a 

 snow-white mass of crystals. If the solutions are not too strong, they are ob- 

 tained in the form of needles occupying a great bulk when in the mother liquor, 

 but shrinking very much when pressed. They are less soluble in alcohol ; I 

 therefore used that fluid to wash them. The alcoholic washings, when kept for 

 some time, deposit needles, often an inch long, but so silky and fragile as to be 

 preserved of their original size with difficulty. They retain their colour perfectly, 

 and, with the exception of losing two equivalents of water of crystallization, are 

 quite unaltered by drying for a few hours at 212°. The salt volatilizes at a consi- 

 derably higher temperature, without residue. The quantity at my disposal was 

 very limited, and being, therefore, obliged to work on small quantities, I found it in- 

 convenient to estimate the cadmium as oxide by the usual process, as the carbonate 

 of cadmium, when precipitated from solutions containing chinoline at the boiling 

 heat, not only has a strong tendency to pass through the filter, but adheres to the 

 paper so strongly as to cause a loss of metal by reduction and volatilization dur- 

 ing incineration. The precipitate was too light to be collected by decantation. 





