On some Combinations of Arsenic with Cobalt. 331 



not aware that the species of this animal has yet been deter- 

 mined, or indeed whether it has ever been described. It is 

 about as large as a full-grown fallow deer. 



The blood was procured from a puncture in the upper lip 

 of a female, under circumstances very favourable for the pre- 

 servation of the size and figure of the corpuscles ; they were 

 quickly dried on slips of glass, and submitted to observation 

 with as little delay as possible. 



The greater part of the blood corpuscles presented the 

 usual circular shape, although often irregularly triangular, 

 quadrangular, or polygonal; and there were many of the sin- 

 gular forms described in the Muntjac, Porcine, and Mexican 

 Deer. The latter particles corresponded very nearly in size 

 with the measurements already given ; the former were rather 

 larger, having an average diameter of 1 -5066th of an inch, 

 the small and large discs measuring respectively 1 -6000th and 

 1 -4000th of an inch. 



Although I would not venture to communicate to the So- 

 ciety any account of the blood corpuscles from a single ob- 

 servation, yet it appears to me that the present one may be 

 considered as an addition to those which I have already made, 

 with as much care as I could, concerning the blood of the 

 other species of deer. 



Whether the peculiar corpuscles exist in the circulation of 

 the animals, or may be the effect merely of changes in the 

 form of the circular discs immediately after their abstraction 

 from the vessels, is a subject for further and special inquiry, 

 and one which may tend to throw some light on the nature 

 of the blood corpuscles. But whatever may be the result, the 

 facts will hardly be less singular and remarkable, and I am 

 not aware that they have hitherto attracted the attention of 

 physiologists, notwithstanding the minute examination to 

 which the blood particles of different animals have lately been 

 subjected. 



XLVIII. On some Combinations of Arsenic with Cobalt. By 

 THEODORE SCHEERER, and WILLIAM FRANCIS*. 



THHE combinations which we have to describe in the pre- 

 * sent paper, were formed in the course of a smelting pro- 

 cess which was introduced some years since by Inspector 

 Roscher, into the smalt-works at Modum in Norway. The 

 object of this process is to deprive the prepared and roasted 

 cobalt ores of a great part of their iron and arsenic by smelt- 

 ing, in order to obtain higher and purer kinds of smalt from 

 them. 

 First Combination. This forms long fascicular conglo- 



* Communicated from Berlin by the Authors. 



