INDEX. 



Pontine lake. Why dangerous, p. 147. — How to correct 

 it, p. 291. 



Potatoe leave:. Their air, p. 26. — Their faculty of con- 

 taminating good air by night- exp, 43.- — Yield bad 

 air by night, exp. 37. 



Priefihy, the rev. Dr. his difcovery of the dephlogifti- 

 cated air, p. xix. — His difcovery of the Eudiometer, 

 p. lx.— His difcovery of the dephlogifticated air from 

 water alone, p. 22. — His difcovery that plants thrive 

 better in putrid air, p. xxiii. and p. 62. — That air of 

 hot-houfes is unwholefome, p. 50. — That a rofe con- 

 taminates air, p. 55. — His fentiment upon vegetatiou 

 in regard to air, p. xxiv. 



Pringle, Sir John, his difcourfe, caufe of the author's 

 purfuing the object, p. xvi. 



Putrid difeafes, new method of curing them, p. xlvL 



R. 



Rajberry Jbrub, peculiar manner of yielding dephlogifti- 

 cated air, p. 1 9. 



Refpiration, if plants have organs of refpiration, p. 34. 

 In what manner it contaminates air, p. xlvi. 



Rome, why its air unwholefome, p. 146. 591. How to 

 remedy this mifchief, 291. 



Room. Effect of plants kept in a room , p. 67. Effect 

 of a tree Handing near the windows, p. 144. 



Roots. All roots contaminate air, few excepted, exp. 



, 7; — 74, p. 53. — Abforb inflammable air, exp. 116. 



The 



