FOKESTEY. 541 



Cacao experiments, 1911 (Jour. Bd. Agr. Brit. Guiana, 5 {1912), No. Jf, pp. 

 232-23.'f). — Data are given showing ttie yields of cacao from the manurial 

 experiment fields at the Onderneeming School Farm in 1911. 



During the last 3 years the highest yield has been secured from heavily 

 mulched plats. On the other hand an increased yield has been secured more 

 cheaply by the application of sulphate of potash and superphosphate of lime. 



Street trees, J. J. Levison (Proc. Amcr. Assoc. Park Supts., 13 (1911), pp. 

 35-Jt7, figs. //). — A paper and discussion dealing with the fundamental prin- 

 ciples of street tree planting, care, and selection of species. 



Native trees as hedge plants. A, W. Green (Jour. New Zeal. Dept. Agr., 4 

 (1912), No. (J, pp. -'hi'i—'i'iS, fiOf^- 6). — Notes are given on a number of New 

 Zealand trees which are proving desirable as hedge plants. 



FORESTRY. 



Economic woods of the United States, S. J. Kecord (New York, 1912, pp. 

 VII + 117, pis. 6, figs. 15). — This is a guide or manual for the identification of 

 the economic woods of the United States, including a discussion of the struc- 

 tural and physical properties of wood. Part 1 deals briefly with the more 

 important structural and physical properties of wood, the structural properties 

 being based upon the character and arrangement of the wood elements, and 

 the i)hysical properties being based upon the molecular composition of the wood 

 eh'uients. Part 2 comprises an artificial classification of the economic woods 

 of the United States based upon the structural and physical properties of wood 

 as discussed in part 1. 



Frequent references are made to the literature on various phases of the 

 subject, and lists are given of publications dealing with general classifications, 

 characteristics, and uses of woods. 



Commercial guide to the forest economic products of India, R. S. Pearson 

 (Calcutta, 1912, pp. lX-\-155-\-XlII, pis. 7). — Chapter 1 comprises a short 

 resume of the distribution and classification of the many types of forests found 

 in British India, together with a note on the financial working of these forests. 

 Chapter 2 discusses a large number of the more common timber trees of India 

 and Burma, relative to the distribution, quality, and uses of the timber, approxi- 

 mate value, and yields in various localities. Chapter 3 deals with such minor 

 products as cutch, gums, fibers, resins, tan and dye products, oil seeds, etc. 



Experiments with jack pine and hemlock for mechanical pulp, J. H. 

 Thickens (U. S. Dept. Agr., Forest Serv. [Pamphlet], 1912, pp. 29, pis 15, 

 fig. 1). — Tests conducted cooperatively by the Forest Service and the American 

 Pulp and Paper Association to determine the value of hemlock and jack pine 

 as substitutes for spruce pulpwood are here reported in detail, including a dis- 

 cussion of the equipment used in the experiment, methods employed, calculation 

 of results, comparison of yields, factors which influence quality and production, 

 and a microscopic comparison of experimental pulps and commercial standards. 

 Samples of paper produced from the various tests accompany the bulletin. 



Not only have very promising sheets of pulp been obtained from both the 

 hemlock and jack pine, but paper has been made from them on commercial 

 machines, operating at high speed and under all other conditions of actual 

 commercial practices, which has the strength, finish, and appearance of the 

 standard news paper. The production per grinder, the horsepower consumption 

 per ton, and the yield per cord approximate the averages which obtain in the 

 grinding of spruce. Pulps composed of mixtures of hemlock, spruce, and jack 

 pine in different proportions, which compare very favorably with the ordinary 

 spruce ground wood, have also been obtained. The author concludes that 



