June, 1920) GENETICS 303 



2000. von Ti'hkuk, C. Schilderungen und Bilder aus nordamerikanischen Wftldern. 

 Von Chicago zum Felsengebirge. [Descriptions and views of North American forests: from 

 Chicago to the Rocky Mountains.] Naturw. Zeitschr. Forst- u. Landw. 17: 1-44. PI, 18-63. 

 1919. — Tubeuf presents, in a more or less j)crsonal manner, his impressions of American 

 forests and other plant-formations, gained during a tour in 1913. The present article, the 

 second of a series, deals with the region indicated by the sub-title. Conditions in the vicini- 

 ties of Chicago, Lincoln and Akron (Colorado), are dealt with briefly, bnt greater space is 

 given to the mountain flora, with special reference to the Pike's Peak region of Colorado. 

 The localities of Minnehaha, the Garden of the Gods, the Peak proper, and the Fremont 

 Experiment Station, are described in considerable detail. Almost every forest and her- 

 baceous species of the region is mentioned. A lengthy description is given of the "blue" 

 Douglas fir typical of this region, which the author calls Pseudotsuga glauca. The article ie 

 replete with comments, but reaches no important conclusions. Many of the illustrations 

 are half-tones from original photographs by the author. — C. G. Bates. 



2067. Waentig, P. Zur Frage der Holzaufschliessung zu Futterzwecken. [Wood prepa- 

 ration for fodder.] Naturw. Zeitschr. Forst- u. Landw. 17:44-53. 1919. — A description of 

 the progress made in the utilization of wood for fodder, mainly since 1916. Describes various 

 theories as to the usefulness and availability of the food stored in wood, recognizing that 

 stem- and branch-wood, on account of greater lignification, may have much less food value 

 than leaves and twigs, which are eaten naturally by stock and have long been cured for 

 fodder. Various means for making the nutrients available are described, of which the most 

 successful process seems to be a combined mechanical and chemical treatment. Grinding 

 or cutting, as in the preparation of paper-pulp, is of no avail because of the incomplete opening 

 of the cells and the loss of nutrients through the watering which must accompany so inten- 

 sive a mechanical process. As fodder, wood seems to be especially deficient in proteins, and 

 must be supplemented by some rich food such as animal meal. Its similarity to straw, in 

 this and other respects, is repeatedly mentioned. In spite of its deficiencies, it may be recom- 

 mended, especially for work-animals, as the rougher part of the ration. — C. G. Bates. 



2068. Wale, Bernard N. The removal of hedgerows. Jour. Bd. Agric. Great Britain 

 25 : 1408-1424. 1919.— A plea is made for the removal of the too numerous hedgerows surround- 

 ing farm fields in England. The loss in land due to the space occupied by these hedges is 

 considerable, being 6 per cent in square fields of 4| acres in size, and 4 per cent for 10 acre 

 fields. There would be gain in many ways if the fields were enlarged from 4$ acres, which is 

 the average size in some localities surveyed, to 10 acres. Some data are given on the cost of 

 removing the hedgerows. — M. B. McKay. 



2069. Widegren, K. A., and E. H. Transportbana for skogsdrift, system Widegren. 

 [A transportation system for forest freight, the Widegren system.] SkogsvSrdsforen. Tidskr. 

 17:199-211. 5 fig. 1919. 



2070. Wright, F. A. A further note on thitsi (Melanorrhoea usitata). Indian Forest 

 Records 7: 75-88. PI. 1. 1919. — The apparatus used in tapping thitsi and the methods em- 

 ployed are described. The yields per tree and per chisel are given in local terms, with data 

 on the imports and uses of the oleo-resin derived. Suggestions are made for the regulation 

 and control of thitsi-tapping on government lands. — E. N . Munns. 



GENETICS 



George H. Shull, Editor 



2071. Abe, A. Goma no nisanno Keisitu no Iden Kenkyu Yohd. [Preliminary note of 

 inheritance studies on some characters of Sesamum indicum.] [Japanese.] Taiwan N6zih6 

 [Agric. Rept. Formosa] 153: 15-18. 1919.— Author made experiments on Fi and F 2 hybrids 

 between some races of Sesamum indicum. Seed-coats arc white, black, or brewn; it was found 



BOTANICAL ABSTRACTS, VOL. Ill, NO. 6 



