346 EXPERIMENT STATION RECORD. 



the aphis finally spread from tlie unsprayed trees to some extent to the trees 

 which were sprayed. The best results were secured with a mixture comprised 

 of 5 gal. of commercial lime-sulphur solution, 25 lbs. of quicklime, and 95 gal. 

 of water. The spraying should be done while the trees are still dormant, since 

 the solution burns the foliage severely. 



Rules and regulations of the South Carolina Crop Pest Commission govern- 

 ing the transportation of nursery stock. — Definition of nursery stock (South 

 Carolina Sla. Circ. I4, pp. 4)- — In addition to the text of the rules and regula- 

 tions governing the transportation of nursery stock instructions are given for 

 the fumigation of nursei-y stock originating in South Carolina, as well as the 

 forms of certificates used by the State Crop Pest Commission, 



Hules and regulations of the South Carolina Crop Pest Commission govern- 

 ing the transportation of bulbs, tubers, and roots (South Carolina Sta. Circ. 

 11, p. 1). — The regulations here given deal specifically with shipments from 

 without the State of sweet potatoes, Irish potato tubers, onion bulbs, and 

 strawberry roots. 



E-ules and regulations of the South. Carolina Crop Pest Commission govern- 

 ing the transportation of seeds other than cotton (South Carolina Sta. Circ. 

 18, pp. 3). — ^The text of the rules and regulations is given. 



rORESTRY. 



Silviculture (Z. Cong. Internat. Agr. Gaud, 1913, Sect. 5, pp. [218], fig. 1).^ 

 A report of the proceedings of the silvicultural section of the Tenth Inter- 

 national Congress of Agriculture, at Ghent, 1913, including resumes and in some 

 cases full reports of various papers presented. See also a previous note (E. S. 

 R„ 29, p. 105). 



The distribution of forests in the natural regions of Switzerland, M. 

 Decoppet (Internat. Inst. Agr. [Rome], Mo. Bui. Agr. Intel, and Plant Diseases, 

 4 (1913), No. 12, pp. 1822-1825) .—K brief descriptive account of the forest 

 character of the Jura, the Plain, and the Alps divisions of Switzerland, 



Extension of the Mexican forest jlora to the plateau country of South 

 Africa, D, E. Hutchins (Quart. Jour. Forestry, 8 (1914), ^^o. 1, pp. 16-20).^ 

 Notes are given on the adaptation of a number of Mexican trees to the plateau 

 country of South Africa. 



The Chinese arbor vitae (Thuya orientalis), C. A. Scott (Kansas Sta. Circ. 

 33, pp. 6, figs. 3): — A brief descriptive and cultural account of this tree, with 

 special reference to its use in western Kansas as a windbreak and for orna- 

 mental plantings. Wherever the tree has been planted in Kansas it is making 

 a very successful growth, having withstood the climatic conditions the past 18 

 or 20 years without serious injury, 



Cottonwood in the Mississippi Valley, A, W, Williamson (U. S. Dept. Agr. 

 Bui. 24, pp. 62, pis. 6, fig. 1). — This bulletin reports a special study made of 

 Cottonwood to determine more definitely its characteristics and the general prac- 

 ticability of forest management. Although the conclusions reached apply chiefly 

 to the Mississippi Valley region, those in regard to planting are applicable 

 wherever cottonwood can be grown. 



The subject matter is discussed under the following general headings: 

 Annual cut and present supply, character of the wood, uses, stumpage values 

 and logging costs, range, botanical characteristics, silvical characteristics, char- 

 acter of stands, form and growth of individual trees, growth and yield of 

 stands, management, returns from growing cottonwood, and planting. 



An analysis of the data secured indicates that cottonwood plantings will 

 yield at least 6 per cent on the investment. Cottonwood grows rapidly and can 



