l4.8 ANIMAL TLVIDS. 



Ixaminatienefprieportlons of water, that it is almost impossible to fix any 

 f ej>a ua. standard which can be considered even as the average quan- 

 tity. It is, however, convenient, in observing the <jlfects of 

 reagents upon it, to have it in a rnorc diluted stjte than it 

 usually occurs ; an4 I accordingly united it, by rubbing in a 

 mortar, with a quantity of distilled water, until, by evapora- 

 tion, 1 00 grains of the mixture were found to contain two 

 grains of solid residuum. Upon this mixture the following 

 experiments were performed. 



1. 1 he fluid was still opake, and there was an appearance 

 as if some flocculent matter were suspended in it. 



2. No effect s<5cmed to be pro4uce4 by exposing it to the 

 boiling temperature. 



3. When the oximuriate of mercury was added, no imme- 

 diate visible effect was produced, but after some hours, a ligb( 

 flocculent coagulpm separated and fell to the bottom, having 

 ^he fluid nearly transparent. 



4. A portion of the fiujd, left for a few days without addi- 

 tion, gradually suffered a quantity of matter to separate from 

 it, as in Nq. 3, ; but the separatipn was less complete, and it 

 was much longer in taking place. ^ 



5. A quantity^ of the fluid being passed through a filter pf 

 |)ibulous paper, was rendered perfectly transparent. 



6. The oximuiate of mercury being added to a quantity of 

 No. 5. a very slight pyecipiiate only was produced after some 

 time. 



7- Tl^e addition of the infusion of galls to No. 1. caused a 

 prccipitaition of white fiakcs ; but, aft;er filtration, the galls, 

 produced no effect. 



8. Thp filtered fluid, No. 5. produced a copious precipitate 

 with the aqua lithargyri acetati. 



5. It also produced a considerable precipitate with the ni- 

 tro-muriate of tin. 



10. And with Ihe nitrate of sliver. 



11. Equal weights of the fluid, before and after filtration, 

 were separately evaporated, and the amount of the residuum 

 being ascertained, thp quantities left were to each other nearly 

 as 12 to 8. 



12. The diluted saliva, both before and after filtration, 

 slightly reddened a paper staiped with litmus. 



From 



