80 FORESTRY [BoT. Absts., Vol. X, 



the habitat producing plants yielding most resin for a given amount of material and a mini- 

 mum amount of labor in collecting the rhizomes. Extraction methods are noted. Soil analy- 

 ses and habitat characteristics are given in tabular detail. Of the 3 habitats, No. 1 was con- 

 sidered the best, all things considered. No. 2 produced the greatest rhizome growth but the 

 resin content was lowest. In No. 1, conditions were such that good growth was made and the 

 resin content was high enough to be profitable. It is added that further work would un- 

 doubtedly develop economic relations between grower and manufacturer. — R. P. Hibbard. 



FOREST BOTANY AND FORESTRY 



Raphael Zon, Editor 

 J. V. HoFMANN, Assistant Editor 



(See also in this issue Entries 469, 485, 725, 772) 



504. Anonymous. In the open. The national forests of Washington. U. S. Dept. Agric. 

 Dept. Circ. 138. 78 p., illus. 1920. 



505. Anonymous. Pisgah national game preserve. Regulations and information for the 

 public. U. S. Dept. Agric. Dept. Circ. 161. 11 p. 1921. 



506. Anonymous. Forestry in France. [Rev. of: Woolsey, T. S., Jr. Studies in French 

 forestry; with two chapters by W. B. Greeley, xxvi + 550 p. John Wiley and Sons: New 

 York; Chapman and Hall: London, 1920.] Nature 107: 548-549. 1921. 



507. Cook, I. W., H. Schmitz, and L. A. Grant. The availability of western wood oils 

 for flotation concentration. Univ. Idaho Bull. 16": 1-22. 1921. — Douglas fir (Pseudotsuga 

 taxifolia), western j^ellow pine (Pinus ponder osa) , lodgepole pine {Pinus contorta var. Murry- 

 ana), western larch {Larix occidentalis), western red cedar {Thuya plicata), and white fir 

 {Abies grandis) wood was destructively distilled by the Prichard process and the resulting 

 oils tested for their flotation properties. The oil produced from western yellow pine not 

 only gives good flotation results, but can be produced on a commercially profitable basis. — 

 Henry Schmitz. 



508. Davidson, John D. More about fir sugar. Amer. Bee Jour. 61:233-234. Fig. 1. 

 1921. — It is possible that British Columbia will replace Turkestan and Persia as a source of 

 the rare sugar, melezitose. — /. H. Lovell. 



509. Schmitz, H., and A. S. Daniels. Studies in wood decay I. Laboratory tests on the 

 relative durability of some western coniferous woods with particular reference to those 

 growing in Idaho. Univ. Idaho School of Forest. Bull. 1. 11 p. 1921. — The wood of western 

 white pine, western yellow pine, Douglas fir, western larch, western red cedar, white fir, and 

 Engelmann spruce was subjected to the action of Polyporus lucidus, Lenzites saepiaria, 

 Fomes pinicola, Merulius pinastri, Polystictus versicolor, Pleurotus sajridus, Echinodontiuin 

 tinctorium, Trametes pini, T. carnea, and Lentinus lepideus for 10| months and the amount 

 of decay noted. The conclusion is reached that white fir and Engelmann spruce are not 

 as susceptible to decay as generally thought. — Henry Schmitz. 



