INDEX. 



Poleni, his experiment of balls falling upon foft clay, loi. 

 Polypus, the phaenomena of it, confiftent with the indivi- 



fibiiity and unity of a thinking fubftance, 141, 

 Precipitations (chemical) remarks on them, 341. 



Quick-filver, injefled into the epidydimis, 447. 



R. 

 Rainbow, formed round one's fhadow in the mift, 221. 

 Re-aflion, equal to aftion, 117. 

 Refiftance in matter, the cfFedl of Sn adtive power, 23. 



" ■■ of a fubftance perfedly inaflive, Sa. 



Refpiration, flower in time of fleep, and why, 499, 



S. 

 Salts (neutral) experiments on them, 354, 

 Sinufes of the womb, a defcription of them, 486. 

 Solutions (chemical) remarks on them, 319. 

 Soap leys, their component parts, 483. 

 Sleep, the di&rence it makes on refpiration and the mo« 



tion of the heart, 492, 

 Streamers, of the fame materials with lightning, 216. 

 Stewart (Dr John) his remarks on the laws of motion, 79, 

 Stewart (Matthew) Papp'i AUxandrini propofitio generalior 



fad J, 157. 

 Subftances, material and immaterial, what, 12. 



T. 

 Thinking, has no relation to matter, 139. 

 Theophraftus, his, account of the fexes of plants, 231, &c. 

 Thunder, obfervations on it, 209. 



U. 

 Uteri (gravid) remarks on them, 455, and 481. 



— ; <. their thickncfs, 471. 



Uterus, its figure when impregnated, 46S. 



