Periodical Literature. 733 



To change the Eucalyptus firewood plantations into timber 

 plantations he suggests thinning out and underplanting with 

 Acacia melanoxylon (Australian Blackwood), which is a half 

 tolerant, deep-rooting tree, easily sprouting and easily propagated 

 tree, furnishing a large amount of litter. 



The underplanting is to be done in 20 to 30 year stands, adding 

 some of the finer Eucalypts (rostrata, robusta, marginata). 



Wirtschaftliche Behandlung und Umwandlung der Bestdnde ron Eucalyp- 

 tus globulus. Revista de la Seccion Agronomia, Montevideo. Zeitschrift 

 fur Forst-und Jagdwesen. March, 1910. Pp. 189-90. 



The first proof of the need of seed selection 

 Seed is credited by Zederbauer to A. Cieslar, 



Tree whose experiments at the end of the 19th 



Selection. century proved the existence of geographi- 



cal races of the same species, which diflfer 

 in rate of growth, resistance to disease and in other features. 

 Zederbauer now reports on a series of experiments to find out 

 whether the progeny of different individuals in the same stand 

 or of the same region shows differences in behaviour correspond- 

 ing to the differences of the individuals themselves. The experi- 

 ments have been conducted .for only six years so far, but already 

 give interesting results. Scotch and Austrian Pine and Spruce 

 were used. The seed trees were classified by appearance into 

 loose — broad — crowned, and compact — small — crowned ; the 

 former being the superior, vigorous specimens. Besides these 

 there are deformed specimens. . The small-crowned pines simu- 

 lating spruce, occur especially in mountain regions, those of the 

 plain, where the danger from snow pressure is less to be feared, 

 are usually more frequently broad-crowned. A tabulation 

 describes in detail the site and character of the seed trees ; and 

 another the growth of the seedlings giving the length of annual 

 leaders and height of largest, smallest and medium plants, as well 

 as curves of height growth. In these latter, if the curves of 

 plants from different individuals are compared the difference is 

 striking, but if the progeny of several seed trees is mixed, their 

 average curve, of course, produces the usual height curve, but 

 the results from various geographical regions (Scotland, Norway, 

 Finland, Bohemia) are characteristically different those of the 

 more rigorous climate showing slower development. 



