1916] CURRENT LITERATURE 335 
stomatal opening, such as temperatures ranging from 70 to go° F. and high 
h ity, also chance to favor maximal germination of spores and subsequent 
growth and therefore lead to severe leaf infection. Such studies as these will 
do much to lift the fog that shrouds the problem of infection in the field of © 
phytopathology. The term “stomatal movement,” of the title, is somewhat 
unfortunately chosen. The authors have established a relation between infec- 
tion and stomatal opening rather than between infection and stomatal move- 
ment.—GerorcE K. K. Liv 
Addisonia.—This is the title of a new journal issued from the New York 
Botanical Garden devoted to “colored illustrations and popular descriptions 
of plants.” It is issued quarterly, the first number bearing the date March 
1916, and each number will consist of 10 colored plates with accompanying 
letter press. The subsidy for the journal is furnished by a fund left for this 
purpose by Judge Appison Brown. This explains the name and also the 
color of the cover. The annual subscription price is $10. The illustrations 
and letter press of the initial number are of the highest order, the plants illus- 
trated and described being Rhododendron carolinianum, Cassia polyphylla, 
Robinia Kelseyi, Pachyphytum longifolium, Begonia Cowellii, Echeveria setosa, 
Columnea gloriosa, Fouquieria formosa, Maxillaria ringens, and Nopalea 
A eM, C 
Dimery in Brassica.—Cases in which two or more genetic factors produce 
independently a single somatic character, or modify it in such a manner as 
not to destroy its identity, are being reported frequently. HALtovist” gives 
the results of-crossing a form of Brassica Napus characterized by undivided 
leaves, with a form having strongly pinnatifid lobing. The F, families showed 
several grades of lobing in different plants, rt in 493 individuals out of 8,296 
the recessive unlobed type reappeared, this being almost exactly 1:15. All 
of the 23 separate F, families which make up eo total likewise show a very 
close approximation to the same ratio. The investigation is being continued 
into the F;.—Gro. H. SHULL. 
Pollen sterility and hybrids.—Gates and GoopsPEED® have tested the 
claim that “bad pollen” is a criterion of hybridity by examining certain geo- 
graphically isolated Californian plants which have had no opportunity for 
crossi Trillium sessile giganteum, Scoliopus Bigelovii, Dirca occidentalis, 
Ranunculus californicus, and Fritillaria lanceolata floribunda were selected for 
examination, and remarkably high percentages of bad pollen were obtained. 
Their conclusion is that such pollen is not necessarily an indication of 
*? HALLQvist, Cart, Ein neuer Fall von Dimerie bei Brassica Napus. Bot. Not. 
1539-42. 1916. 
%* Gates, R. R., and Goopspeep, T. H., Pollen sterility in relation to crossing. 
Science 43:859-861. 1916. 
