1835.] Saline Solutions on Fibrin. 



sible from cellular membrane, and carefully washed. In no 

 case was the muscular fibre completely dissolved, or even 

 so much changed as to destroy its fibrous appearance, when 

 viewed with the microscope ; but, in general, the muscular 

 matter was softened, and the liquid gave more or less albu- 

 minous precipitate when boiled. These effects were most 

 distinct with human muscle, less so with the muscle of 

 haddock, very slight with the muscle of ox, and scarcely 

 perceptible with the muscle of sheep. 



12. It follows, from these facts, that fibrin, diff'ers mate- 

 rially in its properties, according to the source from which 

 it is derived ; that in general it yields to saline solutions, 

 at the ordinary temperature^ a substance resembling soluble 

 albumen ; that the proportion of this substance yielded by 

 fibrin varies materially ; that it is greatest in the fibrin of 

 human blood ; that fibrin cannot dissolve in solutions of 

 muriate of ammonia if heated above 130°; and that several 

 kinds of fibrin are very slightly acted on by that solution at 

 any temperature. 



Article V. 



On the Sesquisulphate of Manganese. By Thomas Thomson, 

 M.D., F.R.S., (fee, Regius Professor of Chemistry in the 

 University of Glasgow. 



When neutral solutions of sulphate of zinc and chloride of 

 manganese are mixed together, no sensible change takes 

 place. But if the mixture be concentrated it gradually 

 deposits yellowish-white coloured crusts, which constitute 

 a hitherto undescribed salt of manganese. 



This salt dissolves readily in water, but I could not suc- 

 ceed in obtaining it in crystals. Its taste is sweetish and 

 astringent, and slightly acid. 



16'26 grs. of it, rendered as dry as possible by pressure 

 between the folds of bloating paper, and subsequent expo- 

 sure to a gentle heat, ^^ ere dissolved in water and mixed 

 with a great excess of carbonate of ammonia. The mixture 

 was left for twenty-four hours, and during that time was 

 frequently agitated. It was then thrown on a filter, to 

 collect the white precipitate which had fallen. This preci- 



VOL. II. 2 B 



