190 The Principles of Part V* 



very much the nature of thefe juices. Says 

 a French author: Rn /' armee 1705, // tie 

 plu prefque pas en Juin et en Jiiillet, et ks 

 bleds etoient excellent. Mais en 1707, quoi* 

 quil y ait eu de chaleurs extraordinaires, 

 i I plu ft abondamment pendent les deux mots, 

 que le bles riont rien valu, et ces font pref- 

 tout cchaujfcs. 



I? is obferved, that all plants grow very 

 faft after rains j not only the tefreftrial, but 

 the aquatic. The latter can never be fup- 

 pofed to want water ; fo that this effect 

 muft proceed from fome other caufe, than 

 the increale of nourimment by the roots. 

 The fame effect is obferved to happen, 

 when the fky, from being clear, grows 

 cloudy and ftormy. Perhaps their too great 

 perfpiration may be flopped: perhaps the 

 moifture is fucked up by the pores of the 

 leaves and wood : perhaps, as their nou- 

 rimment depends on the circulation of their 

 juices, and that circulation on the contrac- 

 tion of the trachea or air-veffels, according 



to 



