RADIATION 



63 



a current of dry air into the tube already employed for 

 gases and vapors: 



Name of perfume 

 Patchouli . 

 Sandal wood 

 Geranium , 

 Oil of cloves 

 Otto of roses 

 Bergamot 

 Neroli 

 Lavender 

 Lemon 

 Portugal 

 Thyme 

 Rosemary- 

 Oil of laurel 

 Camomile flowers 

 Cassia 

 Spikenard 

 Aniseed 



Absorption 

 30 

 32 

 33 

 34 

 37 

 44 

 47 

 60 

 65 

 67 

 68 

 74 

 80 

 87 

 109 

 355 

 372 



Thus the absorption by a tube full of dry air being 1, 

 that of the odor of patchouli diffused in it is 80, that of 

 lavender 60, that of rosemary 74, while that of aniseed 

 amounts to 372. It would be idle to speculate on the 

 quantities of matter concerned in these actions. 



12. Aqueous Vapor in relation to the lerrestrial 

 Temperatures 



We are now fully prepared for a result which, without 

 such preparation, might appear incredible. Water is, to 

 some extent, a volatile body, and our atmosphere, resting 

 as it does upon the surface of the ocean, receives from it 

 a continual supply of aqueous vapor. It would be an 

 error to confound clouds or fog, or any visible mist, with 

 the vapor of water, which is a perfectly impalpable gas, 



