INDEX. 



W. 



Water. The nature of its air invefligated, p. 24* 

 Yields by itfelf dephlogifticated air, p. 22. — L$ 

 changeable into dephlogiftigated air, p. 90. 128* 

 Pump-water obibru&s the lead the dephlogiflicated air 

 oozing out of the leaves, p. 83. — Effed of boiled water 

 upon plants, p. 85.— EfFedl of difHIIed water, of 

 river, and rain water, exp. 24. — Of water impreg- 

 nated with fixed air, p. 84. exp. 98. — Water warmed 

 by the fun lofes its power of promoting the production 

 of dephlogifticated air from plants, p, 289, p. 289.— 

 But this faculty is again reftored by cold, ibid. 



Water-pepper. See Perjicaria urens* 



Walnuts contaminate air, exp. 91. 



Walnut leaves. The quantity and quality of their air 

 examined, p. 35. — Their air in the fhade, exp. 46. 

 Very apt to contaminate common air in the dark, 

 exp. 119.-— But mend it again by day, exp. $0. 



Willow leaves. Their air, exp. 2. 20. 25, 26. 280 

 Their air in the fhade, exp. 48. — Contaminate com- 

 mon air by night, and mend it again by day, p. 50. 



Wind may perhaps affect the falubrity of air, p. 35, 126. 



Winter. Its cold checks the general tendency to cor- 

 ruption of different fubflances, p. 142. —and even 

 that of the fubftance of air itfelf, p. 290. 



Tew-tret 3 



