152 FORESTRY [Box. Absts., Vol. X, 



has been introduced into southern rivers of the U. S. A. It is now so abundant in Florida, 

 Louisiana, and Texas as to obstruct navigation. The plant is quite sensitive to salt water but 

 thrives in sub-saline water; it propagates by means of seed and runners. The most effective 

 method of eradication is through spraying with a mixture of white arsenic and sal soda. — 

 E. L. Overholser. 



999. Pantanelli, E. Coltivazione a Roma del Ghessab. (Pennisetiun spicatum.) 

 (Cultivation of Pennisetum spicatum in Rome.] Staz. Sperim. Agrarie Ital. 53 : 47-66. Fig. 1-5. 

 1920. — The present is a contribution to the study of plant adaptations, together with a botani- 

 cal description of Pennisetum and a chemical study of the plant as regards total and protein 

 nitrogen, fats, sugars, starch, hemicellulose, acidity, ash, and phosphorus. An extensive 

 bibliography is appended. — A. Bonazzi. 



1000. Sauvageau, C. Sur des algues marines floridees indigenes pouvant fournir de la 

 gelose. [On the indigenous marine algae capable of furnishing gelatin.] Compt. Rend. Acad. 

 Sci. Paris 171 : 566-569. 1920. — The location is given of beds of gelatin-producing red algae 

 on the coasts of France, Spain, other parts of the Mediterranean, and the extreme Orient. 

 The species available are named and the method of extraction of the gelatin is described. — 

 C. H. Farr. 



1001. Waller, A. E. The relation of plant succession to crop production. Ohio State 

 Univ. Bull. 25': 7-74. 15 jig. 1921. — Following an introduction dealing with the genetic classi- 

 fication of vegetation and the nature of crop ecology, the author presents a general discussion 

 of plant successions and the climatic, edaphic, and biotic factors involved. The 2nd part of 

 the paper treats of the factors influencing crop distribution in the U. S. A.; the importance of 

 economic factors is emphasized. The 3rd part deals with the crop regions of Ohio and their 

 significance. Attention is called to the correlation between the surface geology, natural 

 vegetation, and the crop centers of the state. — E. N . Transeau. 



1002. Weaver, J. E. Correlation between the root development of cereals and grassland 

 associations. [Abstract.] Ecology 1:65. 1920. 



FOREST BOTANY AND FORESTRY 



Raphael Zon, Editor 

 J. V. HoFMANN, Assistant Editor 



(See also in this issue Entries 928, 939, 967, 974, 1035, 1054, 1143, 1277, 1296, 1307, 1319, 1331, 



1368, 1373, 1374, 1383, 1427) 



1003. Anonymous. Acacia bark as an industrial material. Sci. Amer. Monthly 2: 340. 

 1920. 



1004. Anonymous. Forestry legislation. Science 54: 188. 1921. — This article gives a 

 few statistics, especially for the states of Pennsylvania, Minnesota, and California. — C. J. 

 Lyon. 



1005. Anonymous. Report on the Botanical and Forestry Department (Hong Kong, China) 

 for the year 1918. 18 />. [Received in the U. S. A. September, 1919.] — The report consists of a 

 collection of short notes dealing with the administration of this department and is primarily 

 of local interest. The notes deal with the activities of the department in connection with the 

 botanical gardens and various grounds and nurseries in charge of the superintendent. The 

 forestry activities include the formation of pine (species not mentioned) and broad-leaved 

 (mainly Tristania, Melaleuca, and Eucalyptus) plantations, care of plantations, their protec- 

 tion from fire, the work of the forest guards, planting and care of roadside trees, repair of 

 forest paths, clearing away undergrowth for anti-malarial purposes, and the granting of 

 licenses and permits. Appended to the report are 6 tables and a supplement. The tables deal 



