Periodical Literature 623 



fact that the stimulated growth on the convex side exceeded 

 relatively the mean of the north and south current growth, and 

 also the ratio of the west radial increment to north and south mean 

 during 1911. This was even the case on both the west and east 

 sides of trees foiir and five, which were bent alternately east and 

 west. In these two deductions, allowance was made for the 

 maximiim percentic deviation of west-east from north-south radii 

 during 1911 when all the trees grew normally. 



It is noticeable that the absolute radial growth in all four direc- 

 tions was lower in general in the bent trees than in the control 

 tree. 



One wishes the experiments had included more trees. 



J. H. W. 



Experiments in Eccentric Growth of Ash. Quarterly Journal of Forestry, 

 July, 1914, pp. 218-29. 



E. Ramann gives a complete analysis of 



Transfer the ashes and of the nitrogenous content and 



of Mineral phosphoric acid in green and dead leaves of 



Substances oak, birch, maple, and locust. The results 



show that in all cases during the normal 



falling of the leaves there occurs a transfer of nitrogen, potassium, 



and phosphoric acid from the leaves to the trunk of the tree. 



The amotmt of lime and silica, on the other hand, in the dead 



leaves greatly increases and sometimes even doubles. The 



migration of the substances from the leaves into the trunk at the 



time of their death is accomplished in a comparatively short time. 



R. Z. 



Zeitschrift Versuchs-Station 1912, p. 157. 



SOIL, WATER AND CLIMATE 



Professor Graf zu Leiningen at the school 



Soil Maps for Soilculture at Vienna discusses at length 



and the making and use of soil maps, and 



Instruction incidentally propositions of how to teach soil 



knowledge. 



Pointing out the inadequacy of geological maps as soil maps, 



partly on account of their scale, partly because the geologist does 



not consider the character of the rock from the standpoint of soil 



