78 BOTANICAL GAZETTE [JANUARY 
types of leaves, an adult and a juvenile type, the latter being the divided form. 
Under good vegetative conditions the former is produced, while under poor vege- 
tative conditions the juvenile form is developed. A reversion from the adult 
to the juvenile form follows a change from a favorable to an unfavorable vegeta- 
tive condition—W. B. McCatium. 
Lioyp** calls attention to the parallelism between the results of his studies of 
the pollen tubes in the Rubiaceae and those of Lonco in the Cucurbitaceae. — 
Each of these investigators has found that the pollen tubes vary greatly in behavior, 
even in closely related genera or species. They seem to have come independently 
to the same conclusion; that is, that endotropism and ectotropism are not distinct 
from one another; both regard the behavior of the pollen tube as a physiological 
character.—R. B. WyLIr 
sain 
Wricut?’ has published an extended account of the gross morphology, anat- 
omy, and taxonomy of Diospyros as represented in Ceylon. The f 
such interest among dicotyledons that so extensive a study of living eae 
is welcome. In the taxonomic portion of i paper twenty species are recog- — 
nized and described in great detail—J. M 
SrupDEnTs of plant-breeding will be interested in the results obtained by Locx?® 
in conducting a somewhat extensive series of experiments in Ceylon. In his first j 
paper the details of the experiments indicate in the main a confirmation of MEN- 
DEL’s law.—J. M. C 
76 Lioyp, F. E., The pollen tubein the Cucurbitaceae and in the Rubiaceae. 
Torreya 4:86-91. 1904. 
27 WRIGHT, HERBERT, The genus Diospyros in Ceylon: its morphology, anatomy, 
and taxonomy. Annals Bot. Gard. Peradeniya 2:1-106, 133-210. pls. I-20. 1904. 
28 Lock, R« H., Studies in plant-breeding in the tropics. I. Ann. Bot. Gard. 
Peradeniya 2: 299-356. 1904. 
