PROCEEDINGS OF SOCIETIES. 
117 
Bull. Bot. Soc. France (1876, part 4). — In this M. E. van Tieghem 
gives New Observations on the Development of the Perithecium of 
Chietonium. — P. Petit, Attempt at a Classification of the Diatomacece. 
Nuovo Giorn. Bot. (April 5). — In this, two papers are of interest, 
viz., Sig. A. Mori, On Structure of Leaves of Ericaceae, ; and Sig. T. 
Caruel, On a singular behaviour of Zoospores in Cladophora. 
Ann. des Sc. Nat. (ser. 6, vol. iv., part 1). — M. S. Arloing, Ana- 
tomical Researches on the Cuttings of Cactacese ; and M. N. Sorokine, 
Note on the Vegetable Parasites on Anguilluke. 
Bot. Zeitung (May). — Herr J. Peyritsch, On the Ovular Theory. — 
Herr H. Bauke, On the Development of Ascomycetes. 
Botaniska Notiser (May 18). — F. W. C. Areschoug, On Mechanical 
Cell Thickening in Leaves. 
NOTES AND MEMORANDA. 
Zentmayer’s Turn-table. — The ‘American Naturalist’ (July) says 
that Mr. Zentmayer has recently contrived a turn-table on which the 
slide is self-centred for width, by the absurdly simple device of 
bringing its two sides up to the opposite sides of a couple of brass 
pins equally distant from the centre of rotation. The adjustment for 
length is made by hand, guided by circles on the brass plate, or 
for slides of standard size by a pin at one end. The slide may be of 
any reasonable width, and can be easily and instantly decentred for 
refinishing old slides. The table is mounted with a clamp for attach- 
ing it to a table, though it can be furnished on a heavy block in the 
usual manner, if desired. 
Three Foreign Members of the Linnean Society, recently elected, 
have all been more or less distinguished in the pursuit of microscopic 
work. They are as follow : — Pierre du Charte, of Paris, highly dis- 
tinguished for his researches in teratological, physiological, and other 
branches of botany ; Professor Carl Gegenbauer, of Heidelberg, whose 
labours in zoology and the comparative anatomy of the vertebrates 
and invertebrates are acknowledged as of the highest standard ; and 
Professor Rudolph Leuckardt, of Leipzig, to whose philosophical 
investigations into the morphology and physiology of the lower forms 
of animals, and establishment of the group Ccelenterata, zoologists of 
all countries are highly indebted. 
PROCEEDINGS OF SOCIETIES. 
San Francisco Microscopical Society. 
The fifth annual reception of the San Francisco Microscopical 
Society was held on Thursday evening, May 24, at Mercantile Library 
Hall, and was largely attended. 
At the reception, which was, as usual, a gratuitous offering on the 
