40 Forestry Quarterly 



Notes of interest to silviculturists are 

 Bogs of included by Mr. E. N. Transeau in a series 



Huron River of three ecological articles on certain bog 

 Valley. formations in Michigan. Aside from his 



discussion of the physiographic history of 

 the region and its meteorological conditions, the interesting 

 point to foresters is his definite assignment of forest t3'pes to de- 

 scribed formations and situations. He defines three topographic 

 divisions of the Huron basin : " (i) The loose textured, rough 

 interlobate moraine ; (2) the clay morainic belt lying to the 

 southeast of it ; (3) the low-lying plain extending to Lake Erie. ' ' 

 On the lake plain he finds the greatest variety of tree species, 

 among them Fagiis atropiirpureus , Quercus rubra, Ubmis Ameri- 

 cana, Platajius occidentalism Acer saccliarum, Tilia Americana, 

 Acer sacchariniim, Fraxitius Americana, Gleditsia triacanthos, 

 Liriodcndron tulipifera, Gymnocladus dioica, Cercis canadensis, 

 Asimina triloba, and Celtis occidentalis. " The clay morainic area 

 is dominated b}' Quercus rubra, Qu. alba, Qu. velutina, Hicoria 

 ovata, H. glabra, Acer rubrum, Ulmus Americana, and Quercus 

 macrocarpa.'' The forest of the interlobate moraine areas is 

 chiefly made up of Quercus coccinea, 0. macrocarpa, Q. velutina, 

 and Q. alba, mixed to the northeastward with Piiuis Strob2is. 

 The articles show, in highly instructive detail, how in passing 

 from northern Indiana into the thumb of Michigan, one passes 

 from a region dominated by a rich mesophytic, broad-leaved for- 

 est to one of conifer and xerophj'tic, broad-leaved ascendancy. 



The Bogs and Bog Flora of the Huron River Valley. Botanical Gazette, 

 November. 1905, pp 351-375 (with sixteen figures). 



FOREST BOTANY AND ZOOLOGY. 



The influence of weather conditions, on 

 Phaenological the budding and leaf fall of larch and beech 

 Note is discussed by Engler on the basis of ob- 



servations made in 1905. It is pointed 

 out that besides temperature a certain amount of light is needed 

 to effect the leafing-out, especially in light needing species, like 

 larch. While normally the larch leafs 15 to 30 days earlier than 

 the beech, this year the former was late and was in leaf simulta- 

 neously with the beech. It is shown, by the records that both 

 temperature and hours of sunshine during March were below 

 normal, retarding the larch, while April being normal produced 



