1899] CURRENT LITERATURE 435 
He rejects Schimper’s view that the cluster of gemma in Georgia and 
dipodium is homologous with a male “flower,” the gemmez being sterilized 
antheridia ; and also dismisses as improbable Brefeld’s suggestion that they 
are sterile sporangia, like chlamydospores. 
The structure and development of the brood-bodies, their separation, dis- 
tribution, mode and conditions of germination, and the conditions for their 
formation are described. Finally the author furnishes a key to the various 
kinds of brood organs and the species in which they occur. 
A list of the literature, which consists mainly of the {systematic works 
referred to, the special literature being very scanty, and an inadequate index 
complete the work. 
The interest and value of the book lie in the exhaustive treatment of a 
subject, presumably narrow, which has shown itself broad when thoroughly 
studied. It would be interesting to have a similar study of the vegetative 
reproduction among the Hepatice, and we trust Dr. Correns wil] include in 
this thorough investigation both classes of the Bryophyta.—C. R. B. 
NOTES FOR STUDENTS 
V6CHTING, the author of the well-known work on Transplantation and of 
various papers having to do with the correlations of organs and tissues, has 
published the results of some extended investigations on tuberous plants.4 It 
other organs to take their place. In the above cases the replacing organ 1s 
€ssentially the same in kind as that replaced, but 
almost any organ, if properly stimulated, may become a tu 
tuber as a fleshy body used for storage, whether morpholo 
or leaf —a definition that the following results obviously require. 
ange themselves Into two 
uch a position that its nor- 
ber. He defnes a 
gically stem, root, 
The experiments upon vicarious organs arr 
§roups: a tuber ma hen put ins 
; y replace a stem w P ee 
mal function cannot be performed, or a tuber may be developed sa meee 
any organ if the normal formation of tubers is suppressed. ny am 
Plastic plants studied was Oxalis crassicaulis, a plant which no y 
*Prings. Jahrb. fiir wiss. Bot. 34: 1-148. 1899- 
