r 37+ ] 
being the only neutral fait which has this effect on 
the blood, almoft all the neutral falts have the fame. 
In making fome experiments on this fubjeft, I 
have obferved a much more remarkable efted: which 
neutral falts have upon the blood 3 and that is, being 
mixed with it when juft received from the vein, they 
prevent its coagulation, or keep it fluid, and yet, upon 
adding water to the mixture, it then jellies or coagu- 
lates: thus, if fix ounces of human blood be re- 
ceived from a vein upon half an ounce of Glauber’s 
fait reduced to a powder, and the mixture agitated 
fo as to make the fait be diffolved, that blood will 
not coagulate on being expofed to the air, as it would 
have done without the fait; and if to this mixture 
about twice its quantity of water be added, in a few 
minutes the whole will be jellied or coagulated, and 
on fhaking the jelly, the coagulum will be broken, 
and the part fo coagulated can be now feparated as 
it falls to the bottom, and proves to be the lymph. 
In thefe mixtures of the blood with neutral falts, 
the red particles readily fubfide (efpeciallv if human 
blood be ufed) and the furface of the mixture be- 
comes clear and colourlefs ; and being poured ofF from 
the red part, it is found to contain the coagulable 
lymph, which can be feparated by the addition of 
water. 
I have tried all the neutral falts, and have made 
a table of their effeds on the blood, but this table I 
fhall not trouble the Society with at prefent : it may 
be fufficient to obferve that in general they agree in 
producing this change*. And it is lefs neceftary to 
* It may be nectflary to obferve here, that thofe made with 
the volatile alkali, and with the earth of allum, are to be excepted. 
be 
