30 ODOROGRAPHIA. 
is at first white and cloudy like an emulsion, gradually clears as it 
becomes cold, and the oil rises to the surface in the narrow neck, 
forming a yellowish stratum a few millimetres in thickness. It is 
removed by a sort of funnel-shaped spoon, C, made of tin, about 
2 centimetres broad, and pierced with a minute orifice at the apex. 
This is dipped into the neck of the flask and repeatedly plunged 
below the surface of the layer of oil, the oil gradually flowing over 
Fig. 1. 
its brim and the water escaping back into the flask by the hole at 
the bottom. This is continued until all traces of oil have been 
collected. It is then quickly emptied into a collecting flask. It 
is estimated that 1 hectare of land produces 3000 kilos of flowers, 
which yield 1 kilo of oil. 
A more barbarous process of treating a flower so delicate and 
fine as the rose can scarcely be conceived. The oil so manufac- 
tured is, comparatively speaking, scorched and empyreumatic in 
odour, and is very far from conveying to the mind a true idea of 
the natural perfume; but, apart from this consideration, a recent 
