302 FORESTRY [Bot. Absts. 



2060. Ten Houte de Lange, W. G., Jr. Rubberproductie-krommen. [Rubber pro- 

 duction curves.] Arch. Rubbercult. Nederlandsch-Indie 2:105-111. 1918. — This paper 

 presents data and curves showing the falling off in latex production during the so-called "win- 

 tering" of Hevea. The latex flow diminishes when the tree begins to lose its leaves, and 

 increases again as the new leaves expand. Production reaches a minimum, on the estate 

 where the data were obtained, in late July and early August. The curve, however, shows a 

 secondary fall in February and March, which the author explains on the basis of local practice 

 with regard to change of the tapping cut. He also suggests that the ripening of the seeds dur- 

 ing this period may have something to do with the matter. — H. H. Bartlett. 



2061. Tireman, H. Progress report of forest administration in Coorg for 1917-1918. 

 15 p. Bangalore, India. 1919. — A routine annual report. In an experiment to determine 

 what species of evergreen or semi-evergreen trees and shrubs are most suitable for shading 

 the soil in the dry forests of North Coorg the following proved most successful: Pongamia 

 glabra, 83 per cent survival, average height 6 feet; Randia dumetorum, 77 per cent survival, 

 average height 9| inches; Eugenia jambolana, 54 per cent survival, average height 2 feet. 

 The seed was sown at Banawara in 1915. — E. R. Hodson. 



2062. Trafford, F. Annual progress report on forest administration in the provinces of 

 Bihar and Orissa for the year 1917-1918. 53 p. Patna, India. 1918. — A routine report on 

 forest operations in the province. It is stated that no progress was made in the problem of 

 arresting the destruction of private forests in a certain division (Chota Nagpur). A num- 

 ber of applications for protection were received but none from a private proprietor. It is 

 doubtful whether anything short of specific legislation will prove sufficient for the permanent 

 preservation of privately owned forests which are a most important factor in the future 

 prosperity of the country. — E. R. Hodson. 



2063. Tragardh, Ivar. Skogsinsekternas skadegorelse under ar 1917. [Damage by 

 forest insects in 1917.] Meddel. Statens Skogsforsoksanst. 16: 67-114. PL 1-14. 1919 — 

 The article gives a survey of the activities of various forest insects in Sweden during 1917. 

 Among the insects discussed are the following: Scolylus ratzburg, Ips acutninatus, Myelophilus 

 piniperda and M. minor, Ips typograplms, Bupalus piniarius, and Cephaleia signata. A 

 resume is given in German. — G. A. Pearson. 



2064. Van Heurn, F. C. Natrium sulfeit analyses. [Sodium sulphite analyses.] Arch. 

 Rubbercult. Nederlandsch-Indie 3:7-16. 1919. — The superiority of sodium sulphite as an 

 anti-coagulant for Hevea latex is shown by citing various articles published on this subject. 

 Its anti-coagulant properties are due to the alkalinity of a solution of sodium sulphite. So- 

 dium sulphite has the added advantage of giving disinfecting sulphurous acid on being treated 

 with the acetic acid used for the coagulation of the latex, — hence the growth of microorgan- 

 isms and the development of air blisters is made impossible. On account of much adulter- 

 ated and valueless material sold as sodium sulphite, planters are urged to use only the ana- 

 lyzed product. Results on the analyses of 19 different commercial grades of the sulphite 

 are tabulated. — W. E. Cake. 



2065. Vox Greyerz. Das Hagel-, Ton- oder Mandliholz. [Treadle-wood. The identi- 

 fication of spruce (Picea excelsa, Lk.)] Schweiz. Zeitschr. Forstwesen 70: 113-117. 1919. — 

 The identification characters of spruce have been worked out in various ways, but no con- 

 sistent, characters have been found except in some of the varieties. The treadle-wood spruce 

 appears only above an altitude of 1000 m., and the variety chlorocarpa is found above 1200 

 m. above sea-level. Previous investigations which give the color of the leaves, branch- 

 ing habit and bark characteristics have been found to be not always correlated with the 

 wood structure. The characteristics become more definite and pronounced at the higher 

 elevations. Crenations of the wood under the bark have been found as well-defined mark- 

 ings, but these vary in trees growing side by side. — J. V. Hofmann. 



