253 PRIMARY ANIMAL FLUIDS. 



Effeft of re- No effe61 was produced by the addition of the oxymuriate 



*^"'^t'on W°"" of mercury, and the nitro-muriate of tin caufed only a flight 



Iterate heat Opacity. No efFcdl vvas produced by the addition of equal 



nor did it gc-lati- parts of this folution and the infufion of galls. The aqua li, 

 lufe by cooling. . o t 



thargyri acetati added to the folution produced an immedi* 



ate opacity, and after fome tirae a while, fleaky precipitate 

 fell to the bottom of the glafs. No appearance of coagulation 

 was produced by expofing the fluid for fome time to the heat 

 of boiling water, nor was there any tendency to gelatinise by 

 evaporating and afterwards cooling the fluid, 

 Mocpsfrom an 1 afterwards endeavoured to obtain mucus in a ftate of pUr 

 *^ ^^* rity from another fource. For this purpofe an oyfler was agi- 



tated for a few minutes in cold water ; the fluid was filtered 

 and appeared fllghtly opake and glutinous. 



By evaporation it appeared that it had dilTolved about j^ of 

 its weight of animal matter, A quantity of this folution, di- 

 luted with an equal balk of water, was employed in the fol* 

 lowing experiments. 

 Rea^ints. »The oxymuriate of mercury being added to it produced no 



effect. The infiiiion of galls after fome time produced a flight 

 degree of turbidnefs, and at length a precipitate was formed 

 in fmall quantity. The aqua lithargyri acetati caufed an 

 immediate opacity, and after fome time a denfe precipitate. 

 TbeGoulard ?n- Thefe experiments nearly coincide with the former. In 

 feace? ' ^^^' ^^^^ cafes no efled was produced by the oxymuriate of mer- 

 cury, thus proving the abfence of albumen. The fmall pre- 

 cipitate caufed by the galls indicate th^ exiftence of only a 

 very minute quantity of jelly. The efFed was fcarcely as 

 great In this inftance, where the animal matter compofed y^|jy 

 part of the weight of the folution, as was produced by the 

 lame reagent upon a folution of jelly, where it compofed only 

 ToW P^r^ o^ ^'^^ weight of the fluid. Very nearly the whole 

 therefore of the animal matter probably conflfted of mucus, 

 the prefence of which was indicated by the Goulard. 

 Exclttfive tefts; I apprehend that thefe experiments will be deemed fu ffi- 

 unforje. y» q\qi^i to eftablifii a decided and eflential diflference between 



a^. iiln- acec. 



for mucus, ox, "mucus and jelly, independent of the gelatinizing property of 

 '[L?^ ™"*^* ^^'^ ^'*^ latter, the effects produced upon them by the tanning prin- 

 ciple and by the aqua lithargyri acetati are exa611y oppofite. 

 Tan is a moll delicate teft of jelly, but does not in any degree 

 afled mucus. Aqua lithargyri acetati is a delicate teft of mu* 



cus 





