1914] CURRENT LITERATURE five 
Those interested in plant physiology and plant chemistry will find this little 
book of great value on account of the many positive facts stated and because 
of the critical way in which the author has attempted to organize these facts. 
Some of the hypotheses may be more sweeping than the facts warrant, but they 
should serve to stimulate work on these important but difficult problems.— 
Cuas. O. APPLEMAN. 
MINOR NOTICES 
Michigan trees.—The first thing that recommends this little manual? 
to the student of trees is its convenient pocket size (5 by 7.5 inches), which 
makes it more readily useful in the field than more pretentious volumes. 
closer examination reveals the fact that it is well illustrated by carefully made 
drawings of the leaves, flowers, buds, and fruit of each species. The keys seem 
to have been constructed with more than usual care, and are in duplicate, one 
based largely upon the leaves, for use during summer; and a second making use 
of the bud and twig characters as a basis of identification during the winter. 
In order that the bulletin may appeal to as large an assemblage of readers as 
Possible, the use of technical terms has been reduced to a minimum, and those 
necessarily employed are fully explained in a glossary. The arrangement of 
drawings and descriptions of species upon pages facing one another adds to the 
€ase with which the manual may be consulted.—Gero. D. FULLER. 
NOTES POR STUDENTS 
tations and inheritance in Oenothera.—DAvis' has recently reported a 
continuation of his studies of Oenothera. In previous papers* he has described 
the F, and F, generations of hybrids between O. biennis and O. grandiflora. 
The present account deals with the behavior of F,and F ; generations of the same 
or similar hybrids. The data presented are discussed (1) from the standpoint 
of their bearing upon the origin and habit of mutation of O. Lamarckiana, 
and (2) with relation to their possible interpretation by Mendelian principles 
of inheritance. The latter, if one may judge from the methods employed in 
these studies, has been incidental to the former. The primary purpose of the 
investigations has been to determine the possibility of the synthesis through 
ybridization of a type similar in both taxonomic features and mutating habit 
* Ors, Cartes H., and Burns, G. P., Michigan trees. 12mo. pp. xxxiit+246. 
figs. 120. Ann Arbor: Univ. Mich. Bull. N.S. 14: no. 16. 1913. 
3 Davis, B. M., The behavior of hybrids between Oenothera biennis and O. grandi- 
Hora in the second and third generations. Amer. Nat. 47:449-476, 547-371 1913- 
*———, Notes on the behavior of certain hybrids of Oenothera in the first 
hybrids of Oenothera biennis and O. grandiflora that resemble O. Lamarckiana. Amer. 
Nat. 46:377-427. 1912. 
