INDEX. 



The bad effect: of roots is overbalanced by the plant, 

 pi 54. — Their deleterious influence upon the air 

 checked by cold weather, p. 288. 

 Rujhes, Their faculty of correcting bad air, exp« 58, 

 Air of their roots examined, exp. 72. 



S. 



Sabina yields dephlogifticated air by day, exp. 64. 



Sage. See Salvia. 



Salvia. Its natural air is common air, p. 26. — Its air 



by night, exp. 37. 

 Scboolmaftersh A vulgar error among them about the 



wholefomenefs of breathing the evaporation of young 



people, p. 134. 

 Sick per/ons. Danger from keeping green branches or 



plants in their room by night* p. £i. 

 Shade. Plants yield bad air in the made, exp. 36. £$* 

 Skin. Air from our ikiir is continually difcharged by 



way of an infenfible perforation, p. 12Q, — Flow it 



iffues, p. 130.— Its nature examined, p. 133. — How 



to collect it, p. 130. — Is of a poifonous nature, 133, 



134. — Not better from young perfons, p. 134. — Ig 



is mixed with atmofpherie air, p. 13^. 

 Spam. Air of Spars corrodes glafs, p. 122.— Is 



changed into ftone by the contact of water, i£>id, 

 Spring. Difpofition of the atmofphere in the fpring, 



p. 142. 



Z z Spurge, 



