74 BOTANICAL GAZETTE {your 
and geographical distribution of the various sorts. The book is full of good 
information put in an attractive style and should find abundant welcome— _ 
O. W. CALDWELL. 
MINOR NOTICES. 
THE THIRD FASCICLE of “Illustrations de la Flore du Congo,” by Wik 
deman and Durand, has just appeared, containing twelve plates, with des — 
criptive text. The plates are exceedingly handsome, and their number ha 
now reached thirty-six.—J. M. C. 
A NEw classification of the Leucobryacezx is proposed by M. Jules — 
Cardot in Revue Bryologique 2631-8. pl. 7. 1899. It is based chiefly upo 
the anatomical characters of the leaves as shown by cross-sections, such 
the presence or absence of sclereides, and the form and arrangement of tit 
chlorophyllose cells.—C. R. B 
SOME RESEARCHES of Loeb upon the influence of alkalies and acils 
upon embryonal development and growth’ led to results which may hae 
NOTES FOR STUDENTS. 
. pears lea 
GEORGE J. PEIRCE has been studying the nature of thea Pe 
and fungus in lichens? 
€ author also affirms that the central body of the gonidil 
as Ramalina, Usnea, and Spherophorus, is a nucleus, not a pyrene! . 
HERMANN VON SCHRENK® has been investigating a disease of 7% ee 
known as peckiness, and also a similar disease ot Libocedrus ss y 
both cases the wood is destroyed in localized areas, which are surround —e 
7 Archiv f, Entw.-mechanik der Organismen 7:631-641. pi. 7. 1898. 
* Proc. Calif. Acad. Sci. II. x: 207-240, pls. 41. 1899. 
9Eleventh Ann. Rep. Mo. Bot. Gard. I-55. pis. 6. 1899. 
