SCIENTIFIC SUMMARY. 
265 
an impure naphtha, called Kerosene, is produced. By careful redistillation, 
a very volatile fluid is obtained, called Kerosolene. 
This is a colourless, nearly tasteless, highly refractive, inflammable licpiid. 
When a phial full of kerosolene is grasped by a warm hand, the licpiid gives 
off bubbles of vapour, which have a faint odour not unlike that of chloroform. 
The peculiar anaesthetic effect of this substance was first noticed, from its pro- 
ducing torpor on a workman employed to clean out a kerosene oil cistern in 
Boston. This property naturally attracted the attention of medical men, and 
the physicians of Boston are now employing kerosolene in the place of chloro- 
form and ether, it is said, with the most satisfactory results. Beyond its 
value as an anaesthetic agent, this volatile licpiid promises to become of great 
use in the arts. 
HE forthcoming International Exhibition has undoubtedly proved a 
stimulus for exertion among all classes of photographers, and these 
efforts are by no means restricted to the well-known operators of this 
country. We are given to understand that much space has been applied 
for on the part of intending foreign exhibitors, whose works will be 
brought into somewhat close competition with the artistic productions of 
our countrymen. The decision promulgated by the Royal Commissioners 
respecting the classification of these works of art with the mechanical 
drawings, models, and other illustrations of engineering science in the 
great building has been called in cpiestion, and warmly discussed by the 
several journals devoted to Photography, most of which have urged the 
claims of photographic artists in favour of being placed in companionship 
with the older and better recognized departments of fine arts. In answer 
to this natural and well-grounded complaint on the part of the photo- 
graphers, the Engineer has replied by taking up arms in defence of the 
profession, and deemed it requisite to assert the high character of the 
decorative arts among the examples of which it is proposed to include the 
results of photography. 
In reviewing the progress made during the last few months in the 
practice and applications of photography, the Enamels executed by the 
patented process of M. Joubert deserve to be mentioned among those of 
first importance. The specimens recently produced by this gentleman 
include examples of different styles of photography transferred to, and 
burnt into the vitreous surfaces of glass and porcelain, and these results 
are not confined merely to the imitation of the monochrome effects so well 
exhibited and always admired in the ordinary transparent photographs 
upon glass, but are equally well adapted to the representation of colour in 
subjects which have not hitherto been deemed susceptible of treatment by 
any previously known photographic process. 
The method of proceeding usually adopted by M. Joubert is sub- 
stantially the following : — A transparent positive photograph of the object 
to be represented is first prepared in the ordinary way, or any negative 
PHOTOGRAPHY. 
t 2 
