No. 430.] NOTES AND LITERATURE. 827 
An account of double fertilization in Monotropa uniflora is pub- 
lished by Shibata in “Vora of December 4 last. 
In the Journal de Botanigue for May, Guignard has an article on 
double fertilization in Solanacez. 
The mechanism of secretion of extra-floral nectaries is the subject 
of an article by Haupt in Fora, Vol. XC, Heft 1, which also con- 
tains a paper by Lepeschkin on the significance of the water-secret- 
ing organs of plants. 
Meierhofer has a well illustrated article on the bladders of Utricu- 
laria in Flora of Dec. 4, 1901, which also contains a paper b 
Brenner on climate and leaf form in Quercus, and an extensive 
study of Gunnera by Schnegg. 
An account of the developmental history of Quercus is given by 
Brenner in Vol. XC, Heft 3, of Fora. 
An important addition to the literature of plant physiology, in its 
economic bearings, is Dr. Whitten's thesis on * Das Verhältnis der 
Farbe zur Tótung von Pfirsichknospen durch Winterfrost," recently 
published in Halle. 
A handbook of the economic plant products of Ceylon, by Willis 
and Wright, is in course of publication as supplements to current 
numbers of the Avna/s of the Peradeniya garden. 
An interesting account of the fiber Agaves, by Marshall, is reprinted 
from the Journal of Geography in the American Journal of Pharmacy 
for July. 
An illustrated account of the new botanical laboratories at Liver- 
pool is contained in Mature for June 12. 
Several views of the Cape Town Municipal Gardens are published 
in the Gardeners’ Chronicle of June 7. 
A portrait of J. B. Ellis forms the frontispiece of No. 62 of the 
Journal of Mycology. 
A memorial of the Italian botanist Gibelli is separately issued 
from Vol. XIV of Malpighia. 
A biographic sketch of Ramírez, with portrait, is published in the 
Memorias y revista de la Sociedad Cientifica “ Antonio Alzate” of 
October last. 
In Biometrika for April, Mr. Yule has a paper on the variation of 
the number of sepals in Anemone nemorosa, and Mr. Tower a paper 
on the variation in the ray flowers of Chrysanthemum leucanthemum, 
on which subject is added a further note by Pearson and Yule. 
