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Potent, his experiment of balls falling upon foft clay, ge. 
Poxyrus, the phenomena of it, confiftent with the indivifibility 
‘and unity of a thinking fubftance, 125. 
Precipitations (chemical) remarks on them, 303. 
- Q ) 
Quick-filver, injected into the epidydimis, 396. 
R. 
Rainbow, formed round one’s fhadow in the mift, 198. 
Re-attion, equal to action, 104. 
Refiftance in matter, the effect of an active power, 21- 
————of a fubftance perfectly inattive, 72. 
Refpiration, flower in time of fleep, and why, 444- 
S. 
Salts (neutral) experiments on them, 315. 
Sinufes of the womb, a defcription of them, 439. 
Solutions (chemical) remarks on them, 284. and 329. 
Soap-leys, their component parts, 383+ _ 
Sleep, the difference it makes on refpiration and the motion of 
the heart, 436. 
Streamers, of the fame materials with lightening, 195. 
Stewart (Dr Jonn) his remarks on the laws of motion, Jo. 
Stewart (MattHew) Papp: © “Alexandrini propofitio ies 
lior facta, 141. 
Subftances, material and immaterial, what, 11+ 
eB 
Thinking, has no relation to matter, 123. 
Tueorsrastus, his account of the fexes of plants, 208, dc. 
Thunder, obfervations on it, 189. 
U. 
Uteri (gravid) remarks on them, 403, and 426. 
Uterus, its figure when impregnated, 414+ 
Uteri (gravid) their thicknefS, 417. 
