ar utures \\iib 



PROTECTION OF VEGETATION 

 FROM COLD. 



[Paper read before the Royal Society of Edinburgh, 

 Aprils 1864.] 



THE effect of dew in protecting vegetation every 

 clear still night of summer was long ago pointed out 

 by Dr. Wells ; the correctness and acuteness of 

 whose views on this subject have been generally 

 recognised. The hypothesis recently put forth by 

 Dr. Tyndall, that absorption of radiant heat by 

 aqueous vapour in the atmosphere is an effective 

 defence against destructive degrees of cold, and 

 the ready acceptance yielded to it by some of our 

 highest authorities in the popular promulgation of 

 the truths of science, seems to render it necessary 



VOL. n. B 



