Entwicklung, Regeneration, Transplantation. 137 



growth reproduction and milk secretion with a certain degree of vigor, but not in the 

 same degree as manifested by the corn-fed animals. Where a mixture of all the above 

 plant materials was used, the animals responded to the ration with less vigor than to 

 the corn or oat ratious alone, but with more vigor than to the wheat ration. These are 

 the records from the continued use of rations for three years. Monotony of diet was not 

 a troublesome factor and is not of such importance in nutrition problems as usually sup- 

 posed. The urines of the wheatfed animals were acid to lacmus; the urines from all the 

 otber lots were alkaline or neutral to the same indicator. Correction of this acid reac- 

 tion by feeding alkaline carbonates did not restore the wheat-fed group to füll vigor 

 and proper condition. Allantoin was absent from the urines of this group during their 

 jieriod of growth. During gestation it was present. The degree of oxidation of sulphur 

 in the urines of the several groups was not greatly different. 



"The influence of a normal ration, depressing or stimulating, may be feit in a 

 Single gestation period. Wheat-fed animals were changed to the corn ration with marked 

 iniprovement within the year in the size of off'spring and in milk secretion. The con- 

 verse was true when corn animals were taken to the wheat ration." Pearl (Orono). 



8()8) Pearson, Gr. A., The Influence of Age and Condition of the Tree upon 

 Seed Production in Western Yellow Pine. In: U. S. Dept. Agr. Forest Service, 

 Circular 196, S. 1—11, 1912. 



From numerous experiments the following biologically interesting conclusions are 

 drawn: Seed from young trees show a higher germination than seed from old, mature, 

 or over-mature trees. Certain injuries decrease, while others increase seed quality. 

 Yellow pine atfected by heart rot shows a germination 3 percent higher than that of 

 sound, healthy yellow pine. "Spike tops" (i. e., trees with dead leaders) show a ger- 

 mination 15 percent higher than that of healthy yellow pine. The same is true of trees 

 which have been fire scarred at the base. The highest quality of seed is produced in 

 dense stands. [All these cases indicate Stimulation to seed productions following the 

 action of factors which work against vegetative growth. Ref.] Mistletoe infection 

 injures the quality of seed. Pearl (Orono). 



309) Hutt, W. N., Pecans. In: Bulletin of North Carolina Dept. Agr., 32, 9, S. 1— 46, 

 1911. 



Containing interesting data regarding the biology (growth, varieties, variations etc.) 

 of the pecan. Figures are given of nuts (Fl) of crosses between the pecan {Hicoria pecan) 

 and the "bitter nut" {Hicoria aquatica) and also between the pecan and the hickory. 

 [The meager data jaresented suggest that certain characters of the pecan are inherited 

 in Mendelian fashion. Ref.] Pearl (Orono). 



Hierzu: Nr. 346, 399, 409, 412, 449, 450. 



Entwicklung, Eegeneration, Transplantation. 



370) Evans, A. W., (Yale University). Pranching in the leafy Hepaticae. In: Annais 

 of Botany, Bd. 26, Heft 1, S. 1—37, 1912. 



The Jungermanniaceae (a group of Liverworts) show two types of branching, ter- 

 minal and intercalary. Four distinct types of terminal branching are described. The 

 leaves at the base of a terminal brauch are frequently modified, some of these modi- 

 fications representing reversionary tendencies and others si3ecial adaptations. 



The spirals of intercalary branches show no relation to that of the main axis. 



There is some evidence, derived from phylogenetic and ontogenetic considerations, 

 that the various types of branching have originated in a certain order, and that this 

 sequence may have appeared independently in different developmental lines. 



Gates (London). 



371) KÖvessi, Fran^ois, Influence de l'electricite ä courant continu 

 sur le developpement des plantes. In: C. R. Academie des Sciences de 

 Paris, 154, No. 5, S. 289—291, 1912. 



Les resultats des recherches de Kövessi montrent que l'electricite, ä cou- 

 rant continu, est nuisible ä la germination des plantes et au developpement des 

 graines. 



