PERFUMES AND TEMPERATURE 41 
are now and then sprayed with water from a syringe, and 
the evaporation or the grateful odour, or perhaps both, 
cools and sweetens the room at the same time. Mrs 
Earle, in that charming work “ Pot-pourri from a Surrey 
Garden,” tells us she places dried leaves of Verbena, 
Lavender, and sweet-scented Geraniums in bags, and 
places them under and behind the cushions of her chairs, 
much to the enjoyment of her visitors, who wonder from 
whence the delicate perfume comes. In the East it is a 
common practice to place bags of lime, or orange leaves 
and lemon-grass, under the mats near the doors, so that 
the pressure of each one entering aids unconsciously in 
perfuming the rooms. In Borneo I saw the girls of the 
villages wrapping or coiling their glossy black hair well 
oiled around Jasmine or Champac flowers, so that by 
this personal enfleurage their coiffure was a sweet one 
next morning. - I believe also that by their thus perfum- 
ing themselves they to a large extent escape malarial 
fevers, so common in low-lying tropical regions. 
PERFUMES AND TEMPERATURE 
The late Professor Tyndall made a series of very 
elaborate experiments as to the absorption of heat by 
odorous vapours. ‘Their action is enormous in this 
direction as compared with that of pure (z.e. unscented) 
atmospheric air; and it was found that the least energetic 
of the odours employed, viz. patchouli, had thirty times 
the cooling effect of fresh air, and that of the most 
energetic, viz. cassia, had actually Iog times the effect. 
St oa Absorption Pevfinies Absorption 
per 100 per 100 
Patchouli . : : . 30.0 | Lavender . : : s' t6O.0 
Santal j : : oH a2s0n) Lemon), 2 ‘ ‘65.0 
Geranium . : : . 33.0 | Portugal. : : i OFLO 
Oil of Cloves. : « 33.5 |Fhyme . : : Et HOS IO 
Attar-of-Roses . ; . 3.65 | Rosemary : A a kw eee) 
Bergamot . ; ; . 44.0] Oil of Laurel . : - 80.0 
Neroli : : : . 47.0-+ Cassia. . : - 109.0 
