822 JOURNAL OF FORESTRY 



BOTANY AND ZOOLOGY 



In 1912 Briggs and Shantz defined permanent 

 Determination wilting in plants as attained when they do not 

 of Wilting recover their turgidity in a period of 24 hours 



in Plants when surrounded by air saturated with water 



vapor. Bakke has recently used standardized 

 hygrometric paper in determining the extent of wilting and the perma- 

 nent wilting point in studies on the water relations of plants. From the 

 results of investigations extending over two seasons, the author con- 

 cludes that the transpiring power of plants as determined by standard- 

 ized hygrometric paper gives an accurate knowledge of the internal 

 water relations of a plant. The exact wilting point as determined by 

 this method occurs when there is a serious rupture in the water columns. 

 A high evaporation gives an increased transpiring power, but during 

 the process of wilting the index of foliar transpiring power comes to 

 be independent of evaporation. Older leaves wilt long before younger 

 ones and the time interval varies with age. 



J. W. T. 



Determination of Wilting. The Botanical Gazette, Vol. LXVI, August, 1918, 

 p. 81. 



Japanese larch (Larix leptolepis) has been 

 Japanese planted to a limited extent in eastern United 



Larch States, where, in its juvenile stage, it makes a 



remarkably rapid growth. In England and else- 

 where on the continent of Europe it has been planted much more ex- 

 tensively, and observations on the species there should be of interest to 

 those who have planted this species in the United States. H. R. Beevor 

 describes his experience with the tree in England since 1901. For nine 

 successive years he planted from three to four acres each year, either 

 pure or in various mixed stands with other conifers or with hardwoods. 

 In early youth the Japanese larch in England, according to the au- 

 thor's experience, exhibits the following characteristics : 



1. Where the. tree thrives it dominates the European larch and com- 

 mon hardwoods strongly. 



2. It is more susceptible to drought than other trees. 



3. It grows well on ground kept clean, but does not usually make 

 headway in the simple pitting of recently felled plantations. 



It is much more tolerant than the native larch. Its silviculture as 

 regards dominance is very different from the latter species. At 1 1 



