48 ODOROGRAPHIA. 
resembling that of camphor, and decomposes on heating. Geranyl 
bromide and iodide may be obtained from this by the action of 
potassium bromide and iodide. 
_. Geranyl valerate, benzoate, and cinnamate have been prepared. 
They are pleasant-smelling liquids, but cannot be distilled without 
decomposition. 
Geranyl ether, (C,)H,;),0, is formed when the chloride is heated 
with water, or to between 100° and 200° with geraniol. It has a 
characteristic smell of peppermint, and boils at 187°-190°. 
Many plants contain in their leaves, wood, and roots volatile 
oils which are likened in fragrance to that of the rose, but the 
likeness is very distant, although the rose is their type of odour. 
The Rhus aromatica (Aiton) or Fragrant Sumach has been 
described by Harper, in the ‘ American Journal of Pharmacy,’ as 
possessing an odour similar to Rose-Geranium. 
“ Rose-wood oil” is distilled from the wood of the Convolvulus 
scoparius; this oil is also called Oil of Rhodium, and before 
the rose-geranium was much cultivated used to be in great demand. 
The odour, which is very weak, is not perceptible until the wood 
is rasped, and the yield of oil is very small. 
The root of the Rhodiola rosea, or “ Rose-root,” when bruised, 
and even when dried, yields a rose-like scent; it is a species of 
Sedum growing on damp rocks on the high mountains of Scotland, 
Treland, and the north of England, also on sea-cliffs. 
The “ Tulip-wood ” of Brazil, Physocalymna floribundum, some- 
times called Brazilian Rose-wood, emits a slight odour of rose when 
rasped ; a precisely similar wood has been imported from China. 
The wood of ‘‘ Dysoxylon Fraserianum,”’ a tree of New South 
Wales, has the same perfume. 
The wood of the Colliguaja odorifera when burned exhales an 
agreeable rose-like smell*. 
In the French Guiana collection of woods at the Paris Exhibi- 
tion, 1878, a specimen of rose-scented wood was exhibited, said to 
be derived from the Licaria Kanali, a species of Acrodiclidium, 
but the essential oil is identical with that of Mexican Lign-aloe. 
The volatile oil of Asarum Canadense is said to be now used 
in the United States to a considerable extent in perfumery for 
strengthening the odour of other perfumes. Its odour is com- 
pared to that of rhodium or santal-wood. 
* Molina’s ‘History of Chili,’ i. p. 129. 
