1052 EXPERIMENT STATION RECORD. 



sod. The cultivation of locust trees for more than one season is of doubtful 

 utility, since if the roots are lacerated sprouts will spring up. Banking the trees 

 with a few shovelfuls of earth each fall lessons the risk of the trees being 

 gnawed by mice. 



The importance of climatic varieties of species of trees for sylviculture, 

 A. CiESLAR {Centbl. Gesani. Fortsic, 33 (1907), Nos. 1, pp. 1-19; 2, pp. 1,9-62, 

 figs. 8). — An account is given of investigations made by the author and others on 

 the adaptability of species of trees grown in high altitudes for planting in low- 

 land countries, and vice versa. The principal trees discussed are the spruce, 

 larch, white and black pine, and sycamore. 



As a result of these investigations the author concludes that in the reafforesta- 

 tion of any area trees should be used which are native to that particular climate. 



Table for determining the financial increment per cent of trees based on 

 their market values, N. B. Eckbo {Forestry Quart., 5 {1901). 'So. 1, pp. 

 31-39).- — This table, prepared by E. Overland, forest estimator in the Norwegian 

 government service, is explained in detail and is said to be of the same value in 

 uneven-aged stands as in even-aged, since the rate of increase of each diameter 

 class is determined separately. 



New method of measuring volumes of conifers, B. E. Feenow {Forestry 

 Quart., 5 {1901), No. 1, pp. 29-36). — The author states that the most important 

 development in mensuration in later years is the substitution of the " form 

 quotient" — as elaborated (after Schuberg's proposition) by Schiffel — for the 

 " form factor." As a result of further investigations made at the Austrian 

 experiment station, Schiffel reports that "all conifers (the European fir, spruce, 

 pine, larch) can be approximately but sufficiently accurately cubed upon the 

 basis of one and the same form quotient table." 



The author gives a brief explanation of Schiffel's method, together with 

 formulas and tables used. 



The influence of light and of changing temperatures on the germination 

 of seeds of cultivated plants, especially pine, A. Atterberg {K. LaudtJjr. 

 Akail. Haudl. och TiilsJcr.. ',', (19(16). Xo. 3-1,, pp. 299-3to).^A review of the 

 literature on this subject is given, together with a report on experiments along 

 this line. It was noted that variation in temperature does not equal the bene- 

 ficial effect of light in the germination of pine and many other kinds of seed. 



The best methods of germinating the seeds of different agricultural crops are 

 discussed. — f. w. woll. 



Observations on the effects of spring and autumn frosts in 1905-1906, 

 H. J. Elwes (Quart. Jour. Forestry. 1 (1901), No. 2, pp. 169-119). — Notes are 

 given as to the effect of frost on a large number of hardwoods, conifers, and 

 shrubs during the spring and autunni periods of 1905 and 190G. 



India rubber on the island of Cuba, H. C. Pearson (India Rubber World, 

 36 (1901), No. 2, pp. 231-2 ',2. flys. I'l). — An illustrated account of a large num- 

 ber of species of both exotic and native rubber-producing i)lants found in Cuba, 

 with suggestions as to the value of the different species. 



Present and future phases of the India rubber industry, Tobler (Sitzber. 

 Naturhist. Ver. Preuss. lihcinlande u. Westfalcns, 1906, I, pt. C, pp. 1-9). — This 

 is a brief report of a lecture delivered by the author on the various phases of 

 the rubber industry, in which mention is made of the synthetic production of 

 caoutchouc by Harries from the residue obtained in the manufacture of sugar. 

 ltef('renc(> is also made to the various families of rubber-producing plants. 



The cocoanut palm in Ceylon, J. Ferguson (Jour. Ceylon Branch Roy. 

 Asiatic Soc., 19 (1906), No. 51, pp. 39-10, map i).— This is a paper on the 

 beginning, rise, and progress of cocoanut cultivation in Ceylon from earliest 

 times to IGGO, the close of the Portuguese occupation of the maritime provinces. 



