1898] CURRENT LITERATURE 447 
first catalogue of the kind was that of Lesquereux, published more than 
twenty years ago, and containing 706 species. The present catalogue testi- 
fies to the fact that since that time species have been described with great 
industry. Although no statement is given as to the number of species, it is 
remarked that the Potomac flora alone now numbers more than the total 
‘Cretaceous and Tertiary floras known to Lesquereux. The catalogue is areal 
bibliography and must prove of great service.—J. M. C. 
NOTES FOR STUDER: 
H. H. Dixon has turned his attention to transpiration, and in Proc. Roy. 
Irish Soc. III. 4 : 618-635. 1898 discusses the effects of stimulative and anzs- 
thetic gases on transpiration, and transpiration into a saturated atmosphere. 
B. 
CZAPEK points out an interesting case of adaptation in leaves of Cirsium 
eriophorum. Plants growing in very sunny situations on the southerly moun- 
tain slopes in central Bohemia had the segments of their pinnatifid leaves 
erected into two comb-like rows, while in shady places these are transverse. 
The erect segments of the sun-beaten leaves were inrolled at the edges and : 
were different in structure from the shade leaves, having palisade cells 25 
per cent. longer, and richer in chlorophyll. The same diffe was remarked 
between the erect segments and transverse portions of the same leaf.— 
THE CYTOLOGY of the yeast cell has been a difficult matter to investigate, 
but important results have been obtained by Janssens and Leblanc.* They 
used malachite green, dahlia, gentian violet, Delafield’s haematoxylin, and 
“black. hamatoxylin ” (black hematoxylin differs from Delafield’s in that the 
ammonia alum of the latter is replaced by iron alum). These a show 
that every yeast cell contains a nucleus anda nucleolus. During budding 
there is indirect division of the nucleus in some species, while in the common 
Saccharomyces cerevisie and some others the division is direct. Cells about 
to produce spores contain two nuclei which fuse. The resulting spore on 
germination shows a much modified form of division. The paper is illustrated 
by excellent plates.— CuHAs. J. CHAMBERLAIN, 
NDER THE TITLE Analecta bryographica Antillarum Dr. Karl Miiller- 
Halle has published” a long list of mosses from the Greater and Lesser 
© (Esterr. bot. Zeit. 48: 369-371. 1898. 
2 TANSSENS, Fr. A. and LEBLANC, A.— Recherches cytologiques 
levure. La Cellule 14: 203-343. 1898. 
sur Ja cellule de 
** Hedwigia 37 :(2—?) 266. 1898. 
