128 
POPULAR SCIENCE REVIEW. 
MICROSCOPY. 
[In accordance with their true and recognized relations, it has been 
deemed expedient to distribute those portions of the Quarterly Retrospect 
embraced by the above term, among the three sections : Botany, Zoology, 
and Medical Science. — Ed. Popular Science Review.] 
PHOTOGRAPHY. 
T HE meeting of the British Association recently held at Newcastle- 
upon-Tyne has been unusually attractive and successful as regards 
the progress recorded in several of the grand departments of science ; but 
it cannot be said that the practice and theoretical basis of photography 
have been so greatly advanced as were many other branches of applied 
science which came forward for discussion. The supply of papers con- 
tributed under this head was scanty, and in some respects wanting in 
interest ; a result attributable, we think, to the non-recognition of a 
special section devoted to photography and its results. There were, 
however, several matters brought under the notice of the sections devoted 
to chemistry and physical science which involved the application of 
photography, and wherein the resources of this art had aided in illus- 
trating the subject : thus, the report of the Kevv Committee described 
the arrangements employed for registering, by means of photography, the 
oscillations of the magnet, and the constantly varying indications of 
sundry meteorological instruments. The adaptation of the camera to the 
telescope, and the use of such apparatus in astronomical research, were 
likewise pointedly illustrated. The chemical properties of gun-cotton 
were fully discussed in an interesting report devoted to a comparison of 
its propulsive effects with those of ordinary gunpowder. The latest 
results obtained by Mr. H. Fox Talbot in his experiments upon the aid of 
photographic engraving were exhibited, one or two of which evidenced 
very considerable improvement upon former specimens of the kind. 
Professor C. Piazzi Smyth showed a series of photographs taken from the 
Peak of Teneriffe, and at an altitude of about 10,000 feet ; the 
distinctness with which the distant landscape was rendered appeared to 
justify the assertion that the upper regions of the atmosphere favoured 
the action of the chemical rays upon the collodionized surface exposed in 
the camera. Mr. Glaisher’s lecture on aerial investigations was illustrated 
by photographs taken by Messrs. Negretti & Zambra, of Hatton Garden. 
One of this series, showing the lecturer with his instruments arranged, 
and accompanied by Mr. Coxwell, in the car of the balloon, appears as 
though it w r ere taken during the ascent, and just before entering the 
clouds ; this sketch is, however, a composition picture, the several parts 
being very skilfully united, and the background painted in with good 
effect. The Abbe Moigno exhibited some photo-lithographs, and described 
