324 BOTANICAL GAZETTE [OCTOBER 
The view of Baur is sustained throughout, that these two “graft hybrids’”’ 
consist of a core of Crataegus tissue overlaid by a mantle of Mespilus. 
In Crataegomespilus Asnieresii the mantle is the single epidermal layer, while 
su 
ing results from periclinal divisions in the second subepidermal layer, the 
author argues that no chimera would be able to maintain itself as a chimera 
in which the mantle should consist of more than two layers. Several “rever- 
sions’’ to one or the other component species, and changes from one of the 
chimeras to the other, are described and easily explained, and one sectorial 
branch is figured and described—G. H. SHULL. 
Albinism in maize.—The important studies of Emerson? on the inheritance 
of albinism and partial albinism in maize have been continued by one of his 
chlorophyll to reach maturity. Both of these sorts of albinism prove to be 
simple Mendelian recessives to the normal green stains. The pure white seed- 
lings could not be used in breeding, but the yellowish white supplied several 
mature plants which were selfed and which gave progenies consisting entirely 
of yellowish white seedlings. When plants heterozygous for the pure white 
were crossed with plants heterozygous for yellowish white, all of the offspring 
were.green, showing that the normal green plants possess two determiners, 
the absence of one of which gives rise to pure white seedlings, while the absence 
of the other gives yellowish white seedlings. In confirmation of this interpre- 
tation, the second generation from these crosses between the heterozygous 
plants consisted of four different kinds of families: (a) all green; (6) green and 
pure white in the ratio 3:1; (c) green and yellowish white in the ratio 3:1; 
and (d) green, yellowish white, and pure white in the ratio 9:3:4. These 
results demonstrate the existence of the same genotypic situation in maize 
that Nitsson-EHLE‘ assumed to be present in rye in which pure white and 
yellowish white albinos were also found. 
A continuation of the work on yellowish green (chlorina) plants described 
by Emerson confirmed that investigator’s conclusions that the yellowish 
2 Emerson, R. A., The inheritance of certain forms of agen en reduction in 
corn leaves. Rep. Nebr. Agric. Exp. Sta. 25:89-105. 1912 
3 Mires, F. C., A genetic and — study of certain types of albinism in 
maize. ee Genet. 4:193-214. pl. 
N-EnLE, H., Einige oa 08 tungen_ iiber erbliche Variationen der 
Chlrophyigescat bei eg Getreidearten. Zeitschr. Ind. Abstamm. Vererb. 
289-300 
