24. ODOROGRAPHIA. 
(R. eglanteria, L.), possess a still finer odour, recalling that of 
Jasmine. The flowers of this group (Rubiginose) are generally 
quite devoid of odour, but those of R. lutea are said to develop an 
odour resembling a mixture of bugs and coriander; the same is 
said of R. platyacantha and R. capucine, especially the variety 
bicolor (Jacq.). It has been noticed that roses flowering under 
glass give off a greater amount of perfume than those cultivated 
in the open air; the reason of this is obscure, but it is perfectly 
certain that under no conditions is the odour fully developed 
except in very hot climates, where the power of the sun affords 
the maximum benefit of light and heat. 
The flowers of Rosa gallica (which are used officinally) are but 
feebly odoriferous when freshly gathered, their perfume develops 
gradually in the process of desiccation, while that of the Damask 
rose is almost destroyed by drying. 
In Bulgaria the flowers grown for the distillation of the otto 
are gathered before they commence to open, and a little before 
sunrise. Were they gathered later in the day, when fully expanded 
by the heat, the perfume would be stronger, but not so sweet, and 
the resulting essence would be of less value. It has been noticed 
that previous to a storm, or atmospheric disturbance, the odour of 
the rose seems strangely increased ; this may be by reason of the 
oxidizing influence of the ozone in the atmosphere, or it may be 
that our perceptive faculties are sharpened at such moments. In 
further illustration of the capricious nature of this perfume, and 
the extraordinary complexity of its forms, it is stated that not only 
in the whole list of roses are there no two which develop precisely 
the same odour, but that in the same species, and even on the 
same plant, there are not found two flowers absolutely identical 
in odour,—even vet further, that it is a well known fact amongst 
rose-growers that at different times in the day an individual 
flower will emit a different perfume. 
The essential oil of rose can rarely be obtained pure. In India 
the natives seem to prefer it adulterated, especially with oil of 
santal-wood. ‘The word Afar in India is used like the word Adir 
solidifies, when placed in contact with a fragment of the original crystals, to a 
mass, which melts at 30°. This odour of pippins, akin to that of Sweetbriar, 
is noticeable in the flowers of Agrimonia eupatorium, and in all parts of the 
Agrimonia odorata, 
