120 FOREST BOTANY AND FORESTRY [BoT. Absts., Vol. VII, 



oped a strong, stocky stem with many branches. The Italian popple produced a straight, 

 upright, slender stem, and few branches, although its growth almost equalled the Canadian. 

 — J. V. Hofmann. 



814. Pritzel, E Die Grettstadter Wiesen [Germany]. [The meadows of Grettstadt.] 

 Bot. Jahrb. 55 (Beiheft) : 83-112. 1 map. 1919.— See Bot. Absts. 6, Entry 1510. 



815. Proschowskt, A. R. Les Coniferes dans les terras calcires sur la Cote-d'Azur. 

 [Conifers in calcareous soils at Cote-d'Azur.] Rev. Hortic. [Paris] 92:75. 1920. — See Bot. 

 Absts. 6, Entry 1869. 



816. Ramaley, Francis. Subalpine lake-shore vegetation in north-central Colorado. 

 Amer. Jour. Bot. 7: 57-74. 6 fig. 1920.— See Bot. Absts. 6, Entry 1511. 



817. Ramirez. Gonzalo. Una neuva planta hulifera. [A new rubber plant.] Rev. 

 Agric. [Mexico] 5: 118-119. 1919. — Gives a description of a plant (Cryptostegia madagascari- 

 ensis) from Lower California which gives promise as a source of rubber. — John A. Stevenson. 



818. Rand, R. F. Wayfaring notes from Great Namaqualand [Southwest Africa]. Jour. 

 Botany 58: 53-55. 1920.— See Bot. Absts. 6, Entry 1512. 



819. Regan, W. S. The destruction of Ribes by chemical means. Amer. Plant Pest 

 Committee Bull. 4: 12. 1920. 



820. RiDSDALE, P. S. The Memorial Trees of the United States. Garden Mag. 30: 177- 

 180. 2 fig. 1920.— See Bot. Absts. 6, Entry 1870. 



821. Robinson, R. G. Phases of forestry practice. New Zealand Jour. Agric. 20: 36-48. 

 1920. — Many failures in afforestation are believed to be due to improper varieties, or unwise 

 mixtures of varieties. The importance of good seed is shown by experimental tests. Plant- 

 ing distances should vary according to species and soil. There is danger in planting too close 

 as well as in planting too far apart. It has been found that careful thinning will pay for the 

 labor involved. Plantations of Pinus insignis have yielded £100 per acre, and should yield 

 much greater returns if properly handled. Natural regeneration of pine and gum forests 

 is desirable and practical in some instances. Softwoods, hardwoods, and medium woods 

 best suited to New Zealand conditions are listed. — N. J. Giddings. 



822. Russell, G. A. A machine for trimming camphor trees. U. S. Dept. Agric. Dept. 

 Circ. 78: 3-8. 4 fi^- 1920.— See Bot. Absts. 6, Entry 1989. 



823. ScHLUPi, W. F. Rodent injury to trees, cause, prevention and repair. Jour. Dept. 

 Agric. Union of South Africa 1 : 445-455. 1920. 



824. Sim, T. R. Cultivated trees, I. South African Jour. Indust. 3:783-793. 1920.— 

 No species indigenous to South Africa can be recommended for commercial culture, since 

 in every case there are exotic species commercially more profitable. Commercial tree cul- 

 ture can be most profitably undertaken in the natural forest or grass areas of the eastern slope; 

 i.e., in the Knysna Conservancy, Kaffraria, Transkei, Griqual and East, Natal, Swaziland, 

 Transvaal, Bush Veld, and Transvaal Low Veld. In all these areas summer rainfall predomi- 

 nates, except in the Knysna Conservancy, where rains are more or less regular. — E. M. 

 Doidge. 



• 825. Struby, a. Wald und Weide. [Forest and meadow.] Schweiz. Zeitschr. Forstw. 

 71:199-202. 1920.— From "Schweiz. Alpwirtschaftlichen Monatsblatter."— The value of 

 alpine meadows is emphasized and their value compared with that of woodlands. The most 

 productive portions are found among scattered stands of trees, and this feature should be 

 considered in utilizing these meadows. Areas too rough or steep to be used for meadow 



