Periodical Literature 257 



(61-63%) of the original plants, whilst plantations without en- 

 closure had only 12 to 45 per cent; (3) 30-year plantations of 

 spruces protected by supports contain 38 to 71 per cent of the 

 original trees, as against 3 to 13 per cent in plantations without 

 supports; (4) 16-year stands of untransplanted spruces are less 

 resistant to the movements of live stock than those of trans- 

 planted trees, while the differences in height are very slight; 

 (5) the expenditure incurred in enclosing or providing supports 

 appears to be justifiable from a forestry as well as financial point 

 of view. Protection by means of supports is also an advantage 

 to pasturage." 



Mitteilungen aus dem forstlichen Versuchswasen Osterreichs, 1914, pp. 

 78-83. 



Dr. Tubeuf and Eckley Lechmere furnish 



White Pine additional notes to the life history of the 



Blister blister rust. Lechmere confined himself to 



Rust the study of the parasite of the rust, Tuber- 



culina maxima, which it was hoped might 



be effective in subduing the rust, but this hope does not seem to 



have been fulfilled. The parasite follows the development of 



the rust and comes too late. 



Tubeuf discusses the theories of the origin of the pest, which 

 had been unknown in its native habitat. It seems that most 

 of the Strobus section of pines are attacked by the rust, but that 

 P. cembra, which may be the original carrier of the parasite, is 

 more resistant than the exotics, which did not need to protect 

 themselves against its attacks. Neger explains this partial immu- 

 nity of the native cembra in the development of an "antitoxin" ; 

 Tubeuf considers it due to difference of "disposition." A sug- 

 gested physical condition is that P. strobus forms long, tender 

 summer shoots without hairs, while P. cembra forms short shoots 

 covered with woolly hairs and hidden in the needles. Difference 

 in rate of growth, in density of bark, in water requirements may 

 also help to explain the difference. 



Neuere Versuche und Beobachtungen iiber den Blasenrost der Weymouthskiefer 

 Tuherculina maxima, Rost. Ein Parasit auf dem Blasenrost der Weymouths- 

 kiefer. 



Naturwissenschaftliche Zeitschrift fiir Forst- und Landwirtschaft, Sep- 

 tember-October. 1914, pp. 484-493. 



