[ 47 ° ] 
Sal volatile Cornu Ccrvi. Mufschenb. . 1.496 
Id. Freind . . . . .1.421 
Sal Ammoniac, purum. Item Ens Martis 
femel fublimat. Mufschenb. . . 1.4^3 
Eadcm. Freind. . . .1.374 
Ens Martis ter fublimat. Mufschenb. . 1.269 
Id. Freind. . . . . 1.233 
• 
Mod of the experiments in the ninth table are 
taken from Dr. Freind , who weigh'd the Salts in 
Spirits of Wine, and regifter’d the proportional gra- 
vity of the Salts, to the Spirits. But the misfortune 
is, that the gravity of the Spirits of Wine he made 
ufe of is not regiflcr’d : fo that the experiments can- 
not with certainty be reduced to the common 
ftandard of Water. He has deliver’d the gravity of 
Spirits of Wine to be 0.818, and that of Spirits of 
Wine -rectified to be 0.78. I have fuppofed the 
Salts to. be weighed in the laft, as being the fitted 
for the purpofc : but which he really ufed can only 
be conjc&ured. 
There appears indeed to be a way. to difeover the 
weight of the Spirits of Wine, in which Dr. Freind 
weighed his Salts : for he weighed 60 Grains of 
Mercury, both in Water and in Spirits of Wine, and 
the lofs of its . weight was refpe&ively 44 Grains 
and 2 |. Now the gravities of thefe Fluids muft be 
in the fame proportion, and this would give for the 
weight of the Spirits of Wine 0.627, which is 
much too little for the weight of his own re&ified Spi- 
rits tho even that is.Iefs than what is afligned by any 
other author. So that, upon the whole, nothing 
can really be concluded from this experiment $ and it 
muft 
