FORESTKY. 149 



Kose geranium culture in Algeria, L. Ducellikb (Ecole Agr. Alg6r. Maison- 

 Carrie, Inform. Agr. Bui. IJ,, 1913. pp. J,l, pis. 2, figs, ii).— This bulletin dis- 

 cusses the rose geranium with reference to its histoi-y, botany, climatic and soil 

 requirements, cultural details, and the distillation of essence of geranium. 

 Figures are also given on the cost of culture and the commerce of the essence 

 industry. 



The violet book, A. and D. Allen-Brown (London, Netc York, and Toronto, 

 1913, pp. 109. pis. 10, figs. 3). — A popular work discussing in detail the culture 

 of violets, choice of varieties, and diseases and insects injurious to violets. A 

 general account is also given of the authors' experience in growing violets. 



FOEESTRY. 



Forest atlas: Geographic distribution of North American trees. — I, Pines, 

 G. B. SuDWORTH (U. 8. Dept. Agr., Forest Serv. Atlas, pt. 1, pp. 2, pis. 36). — 

 This is the first part of a series of maps intended to show the geographic dis- 

 tribution of all North American trees now known, exclusive of those occurring 

 wholly in Mexico. 



The geographic distribution of 36 siiecies of pines each on a separate map 

 is shown in the present part. The ranges outlined for the pines are based on 

 all available published and unpublished data of reliable character. 



Municipal reclamation of waste lands, B. A. Heinlt {Municipal Jour., 33 

 (1912), No. 25, pp. 895-897, figs. 2). — A descriptive account of the black locust 

 plantations owned by the city of Los Angeles, Cal. 



Progress report of forest administration in the Province of Assam for the 

 year 1911-12, A. V. Monro (Rpt. Forest Admin. Assam, 1911-12, pp. 20+53+3, 

 pl^ J). — A report on the constitution, management, and administration of the 

 state forests of Assam, including a financial statement for the year. Data rela- 

 tive to alterations in area, forest surveys, forest working plans and miscellane- 

 ous work, forest products, revenues, expenditures, etc., are appended in tabular 

 form. 



The date sugar industry in Bengal. — An investigation into its chemistry 

 and agriculture, H. E. Annett et al. (Mem. Dept. Agr. India. Chcm. Ser., 2 

 (1913), No. 6, pp. VI+281-389, pis. 12), — This comprises a detailed survey of 

 the date-palm sugar industry in Bengal. The following phases are discussed: 

 History and statistics of production, other sugar-producing palms, the agricul- 

 ture of the date palm, tapping, yield and com]>osition of the juice, methods of 

 analysis, factors influencing yield and composition, and manufacture. Consid- 

 eration is also given to the commercial aspects of the industry, including sug- 

 gestions for improvements. 



On some preliminary observations regarding the causes of natural change 

 in the latex of Hevea brasiliensis; and on the depolymerisation of caout- 

 chouc and its conversion, G. S. Whitby" (Orig. Commun. 8. Internat. Cong, 

 Appl. Chem. [Washington and New Ywfc], 25 (1912), Sect. I-Ve, App., pp. 597- 

 621, fig. 1). — An analysis of the causes and conditions of natural coagulation in 

 the latex of H. brasiliensis, including a review of the literature on the subject. 



As a result of his observations the author is led to the hypothesis that in 

 order adequately to explain the changes that spontaneously occur in Hevea 

 latex it is necessary to assume the activity of 4 agencies, namely, a coagulating 

 enzym, an oxidase, anaerobic putrefaction, and aerobic putrefaction. 



Chemical treatment of waste wood, H. K. Benson (Orig. Commun. 8. Inter- 

 nat. Cong. Appl. Chem. [Washington and New York'], 25 (1912), Sect. I-Ve, 

 App., pp. 331-337). — An experimental study of the utilization of debris from 



