146 EXPERIMENT STATION RECORD. 



Weed extermination, G. E. Stone (Massachusetts Sta. Rpt. 1912, pt. 2, pp. 

 35-40, pis. 3). — In this article the author discusses different methods of exter- 

 minating weeds from hiwns. Descriptions of devices for applying arsenate of 

 soda, cutting weeds, and spreading fertilizer are included. 



Legislation ag-ainst the diseases and pests of cultivated plants in Ceylon, 

 T. Fetch (Dept. Agr. Ceylon Bill. 6, 1913, pp. 79-93).— This bulletin contains 

 the text of regulations which have been issued in Ceylon under ordinances en- 

 acted for the control of native diseases and pests and for preventing the intro- 

 duction of others. 



FORESTRY. 



Forest valuation, F. Riebel (Wahlwertrcchming. Vienna and Leipsic, 1912, 

 2. ccL, rev. and enl., pp. XVI+527, pis. 2). — Part 1 of this work comprises a 

 theoretical discussion of various factors which enter into the determination of 

 the money value of a forest or a forest enterprise, consideration being given to 

 the general economic, forest economic, and mathematical fundamental prin- 

 ciples of forestry, and to the various methods of forest valuation. In part 2 

 the application of the theoretical knowledge relative to forest valuation to exist- 

 ing cases is illustrated by numerous examples. 



An economic study of acacias, C. H. Shinn (U. S. Dept. Agr. Bill. 9, pp. 38, 

 pis. 11). — In this bulletin the author discusses the economic importance of the 

 leading acacias in various countries with the idea of bringing about more gen- 

 eral planting in suitable regions in this country. 



A study of the cultural requirements of the many species of acacia which have 

 been grown as ornamentals in this country, chiefly in California, leads to the 

 general conclusion that plantations properly located and managed are as likely 

 to prosper in America as in other countries, where the various species haA'e been 

 a valuable source of tanbark, gums, timber, etc. Attention is called to the fact, 

 however, that thus far our knowledge relative to the success of acacias in this 

 country is chiefly of a cultural nature. It is yet to be determined whether the 

 trees can be produced under close-planted commercial conditions and whether 

 the products can be harvested and marketed in competition with those produced 

 cheaply abroad. 



Manihot caoutchouc, A. Zimmermann {Der Manihot-Eautschiik. Jena, 1913, 

 pp. XI-^342, figs. 151). — ^A treatise on the culture, exploitation, and preparation 

 of the various Manihot rubbers. Other rubber-yielding species are considered 

 in as far as the practices employed in handling them are of value for the culture 

 of the Manihot species. The subject matter is based partially on a review of 

 the literature of the subject and partially upon observations made in German 

 East Africa, as well as on the author's personal investigations. 



An extensive bibliography of the subject is appended. 



Device for planting white pine seed, G. E. Stone (Massaehusetts Sta. Rpt. 

 1912, pt. 2, pp. 31, 32, pi. 1). — The device here described consists of a hollow 

 iron tube about % in. in diameter at the top of which is a funnel and to the 

 bottom of which is attached a bent piece of strap iron about If in. in width 

 and thick enough to give the required rigidity. This is sharpened at the end 

 like a chisel. The hollow handle is extended by means of a rubber tube so that 

 when the blade is thrust into the ground the opening comes over the hole which 

 is made when the handle is brought to a vertical position. The seed is planted 

 by dropping it into the funnel at the top of the handle. 



Condition of experimental teleg'raph poles, treated and untreated, after 

 eight years' service, C. H. Teesdale (Engin. News, 70 {1913), No. 22, pp. 1084- 

 1086, figs. 4). — The work here reported was started in the summer of 1905, 



