114 Forestry Quarterly 



Next, a division of the year into periods is necessary to study 

 the relationship of the animals and its change with the season. 

 This division cannot be made analogous to that of the botanist, 

 because the development of the fauna, although to some extent 

 synchronous with the flora, does not entirely coincide; flower- 

 ing and animal propagation, ripening and births occur at dif- 

 ferent periods. Winter does not occasion such cessation in the 

 animal world as in the flora. Early summer is the time in which 

 all animals are in their babyhood, hence this is the time to be- 

 gin the study. 



The most characteristic forest fauna will be found in a stand 

 of a shade-enduring species like the beech. The author then 

 proceeds to describe in great detail, according to the schedule 

 above regarding the layering or grouping of the environment, 

 the fauna of the beech forest in early summer, in high summer, 

 in autumn, in winter and in spring. 



His description is not a mere enumeration of species, but full 

 with glimpses into the life of the animals and their mutual in- 

 terdependence, each season ending with a discussion of the bear- 

 ing of the information on forest protective measures, which are 

 critically discussed from biological and practical points of view. 



It would lead us too far to given even a sample of the fasci- 

 nating story which the author develops, especially as it deals 

 with species and conditions foreign to us, but the study of the 

 method is recommended to our forest ecologists. 



Die Ethologie der Tierwelt des Buchenwaldes. Centralblatt fur das gesammte 

 Forstwesen, January- February, March-April, May-June, 1915, pp. 24-50, 

 102-30. 



In a detailed discussion, on the basis of a 

 Laws large array of data in tabulations and 



of curves, von Guttenberg disproves the three 



Tree theories which attempt to explain the form 



Growth of trees, namely Pressler's, Metzger's and 



Jaccard's. As is well known, Pressler ex- 

 plains the tree form, physiologically, by conditions of nutrition, 



