64 BOTANICAL GAZETTE [JULY 
tions show forest scenes, especially including views of the greatest of Austra- 
lian trees, the karri. This tree often exceeds 200 feet in height, with a 
straight trunk 150 feet to the first branch.— J. C 
MUSHROOMS AND THEIR USE was the subject of a series of articles by 
Mr. Charles H. Peck, the state botanist of New York, that were printed in 
the Country Gentleman during 1894. These have now been republished by 
permission in pamphlet form by the Cambridge Botanical Supply Co.? Mr. 
Peck is a master of the subject, and this excellent account of the different 
kinds of edible fungi will be especially helpful to those wishing to know them 
well enough to safely select edible forms.— J. C. A. 
Mr. G. C. WHIPPLE observes” that the growth of diatoms in ponds is 
directly connected with circulation of the water due to rising or falling temp- 
erature. Diatoms do not develop when the lower layers of water are quiet, 
but grow best when the water circulates from surface to bottom. In deep 
ponds this occurs chiefly in spring and fall, while in shallow ones there is no 
regular autumn period. These convection currents affect the growth because 
in the two conditions of growth a sufficient supply of nitrates and a free cir- 
culation of air are so met. Temperature does not affect growth appreciably, 
nor the distribution of the diatoms according to the season.— C. R. B 
KLOCKER AND SCHIONNING have reexamined the question as to the ori- 
gin of Saccharomyces." Numerous observers have endeavored to derive the 
species of this genus from other forms of fungi, and the list includes some 
distinguished names. But the last investigators have gone over the question 
with the utmost thoroughness, endeavoring to exclude all sources of error 
which they believe have vitiated the conclusions of other students. They 
summarize their results in a word thus: “There is not a single fact known 
which oo that the Saccharomycetes are developmental members of 
other fungi.” hey rather speak for their being independent organisms, 
just as the Exoascez, since they have morphologically the same develop- 
mental forms as these and no others.— C. R. B. 
Upon A sTuDy of the path of transportation of the constructive materials 
in plants, Czapek presented a paper to the Imperial Acadeiny of Sciences at 
Vienna,” in which he concludes: (1) Research by means of resection of 
tion, utilization, and ohne future management. Roy. 8vo. Perth, 1896. Pp. 57 
30 ee bee and I col. m 
ae Reon Hi nheaiotibe and their use. Cambridge, Cambr. Bot. Sup- 
Co, 1897 . Pp. 80. figs. 72. 50 cents. 
red ounces 234-231... C7, Bot. Cent. 693.351: 
*Compte rendu des travaux du laboratoire de Carlsberg 4:—. ese. [livr. 2]. 
oF sae Cent. 70: 88. ; 
Botanisches cacao 69 : 317. 1897. 
