530 
POPULAR SCIENCE REVIEW. 
The Phenomena of Conjugation in Navicula. 
Baccillaria Paradoxa. 
Geology — 
Eozoon Canadense not a fossil. 
Medical Science— 
The Croonian Lecture. 
The Engrafting of Tissues. 
Method of Examining Nerve-tissue. 
Zoology — 
Anatomy of the Lower Echinoderms. 
The Circulation of Blood in Spiders of Genus Lycosa. 
The Nervous System of the Earthworm. 
PHOTOGEAPHY. 
The Photographic Exhibition . — The annual exhibitions of the London or 
King’s College PhotogTaphic Society and that of the Architectural Union, 
have, for some years since, been pecuniary failures ; this year they combine 
their attractions, and we hope the result will be more satisfactory. The 
photographic collection was got together at less than a month’s notice after 
the Society had announced the discontinuance of its annual exhibitions ; and 
much that is unsatisfactory to those who look to these yearly gatherings as 
representative of artistic and scientific progress may be fairly attributed to 
undue haste. Most of the productions lack the attractiveness of novelty, 
having been publicly sold and exhibited on many previous occasions ; and 
too many of them are uninteresting specimens of the portrait manufacture 
now carried out so largely throughout the kingdom, being such a collection of 
very ordinary cartes-de-visite as may be seen — unfortunately cannot be 
unseen — at nearly half the door-posts, and in nearly aU the shop windows, 
in London. Most of the more eminent photographers are conspicuous by 
their absence ; and this is the more to be regretted, because their works are 
of such a character as would not only prove generally attractive, but would 
elevate the standard of general excellence, although we have one or two new 
names attached to productions of remarkable beauty, and new kinds of very 
attractive work from some old and well-known names. Among the former, 
that of Mr. Falkner, an artist and photographic portraitist of rapidl}’’ in- 
creasing reputation, takes the highest rank ; and amongst the latter Mr. Y. 
Blanchard occupies a conspicuous place, by virtue of a series of pictorial 
figure-subjects, which are not less beautiful than the instantaneous sea and 
sky stereographs with which his name is popularly associated. Mr. H. P. 
Eobinson exhibits some very charming portraits taken in diffused day and 
direct sun light. Of great technical beauty, these are sadly wanting in 
artistic feeling. The passion for giving sentimental names, with wEich they 
have nothing in common, to otherwise good photogTaphs, merely to add 
adventitious interest to things already sufficiently interesting in their way, is 
a fault shared with Mr. Eobinson by several other exhibitors ; but to call a 
