FORESTKY. 147 



FORESTRY. 



On the rate of growth and yield of forests in Vasterbotten County, 

 Sweden, (i. Hkkonhs i S/coi/sninlsfiir. Tidsl-r.. '/ {]'.)<)()). \<k J. ji/i. l-l.'>, hkij) 1, 

 (Itims. 2). — The autiiDr finds that the i)er('eiita!j;e iiu-rement of the pine and spruce 

 forests in this region of about 25,000 hectares amounts to 1.9 per cent or 1.03 

 cubic meters per hectare, ranging from 2.7 to !.:'> per cent for the different types 

 of forest. The total yield is calculated to be on an average 0.90 cubic meter 

 ])er hectare of productive area or over 16,000 cubic meters for the forests sur- 

 veyed. — F. \v. WOI.L. 



Observations on afforesting moor lands, II. Liechti {Schweiz. Ztsclir. 

 Forstir.. .(? (19U6), No. 5, pp. I'll-lJl, pis, 2, fig-^. 5). — The successful afforesta- 

 tion of moor lands with spruce, pine, etc., Is described and illustrated. 



Deforestation in China, B. Wiixis (I'roc. Sue. Amcr. Foresters, 1 {1906), 

 No. .i. pp. I 'i 1-1 'id. pi. 1). — A discussion of the general forest situation in China 

 with s])ecial reference to the defoi'ested regions in northern China. 



Growing locust in Hungaria, A. GaskilL (Forestry Quart., // (1906), No. Jf, 

 pp. 106-111). — The author studied the methods of growing locust in the forests 

 lying in the Great Danube plain about 100 miles south of Budapest where 

 conditions seem to be somewhat similar to those found in the eastern part of 

 our plains region. A money return of about 24 per cent on land valued at $20 

 per acre is secured. Tables are given showing the stands of seedling and 

 second growth locust on sample plats of 1 acre each and of the yield of locust 

 sprout forests of the first, third, and fourth classes. 



Rocky Mountain seedling growth, J. C. Blumer (Forestry Quart.. '/ (1906), 

 No. 2. pp. 9S-10.')). — A number of observations on the reproduction of forest 

 trees in the Pike's Peak Forest Keserve were made. 



The principal species of trees in this district are conifers, and of these, 

 i)ull pine, red fir, limber pine, and Engelmann spruce are most numerous. 

 The seed of all these species needs bare mineral soil on which to germinate. 

 Attention is called to the great density required for natural pruning in the 

 Engelmann spruce. " Trees 3 or 4 in. in diameter, 15 to 20 ft. high, and 40 

 years old. nmst usually stand not over 1 ft. apart in order to lose their branches 

 up to 3 or 4 ft. from the base." 



Germination period of some conifers, E. Zederbauer (Centhl. Gesam. 

 For.stir., 32 (1906), No. 7, pp. 306-315). — A large number of tests were made 

 of the time required for germination of seeds of different species of conifers. 

 With most of the species of Picea, Pinus, Larix, Tsuga, Sequoia, Douglasii, 

 Cryptomeria. and Cupressus, the i)eriod of germination varied from 14 to 28 

 days, and of Pin us strohus from 30 to 40 days after placing in the germination 

 apparatus. 



Germination tests and valuation of pine seeds, Haack (ZtseJir. For.'^t u. 

 Jaydir.. 3s ilUdd), No. 7. pp. J/'il-.'i"!.'), pi. 1). — In continuation of previous work 

 (E. S. H.. 17, ]». 370) the author made extensive investigations to determine 

 (1) how the various forms of pine seedlings which appear in germination tests 

 are to l)e judged with reference to the value of the sampled seed, (2) the in- 

 fluence of light on the germination of pine seed, (3) the relation between 

 luboratoi-y tests and the percentage germination actually obtained under field 

 conditions, and (4) the effect of different degrees of temperature and different 

 amounts of moisture on the germination of pine seed. 



It was found in the first place that many seeds which germinate should not 

 be counted as such in germination tests because the germs are so w^eak that 

 they never produce plants. Illustrations are given showiiTg many of these weak 



