FORESTRY. 1133 



Danger in the repeated repotting of plants, A. Petit (Jardin, 21 (1907), 

 \". .'i8-i. p. 118). — Till' author pcrfofincd ("xpcriiiiciits in onlcM- to determine the 

 offect of different size pots and rciiolt iiiu mi tiu- ,i,'i-(p\vlh ol' i)laiils. 



Several inari.colds were .iri'own in jiols ".i ciii., 14 r\n.. and 1'.» cm. in diameter, 

 res])ectivel.v, and in open irround. In each case the weiiiht of S jtlants was taken. 

 The Ki'owth of the plant was shown to increase with the size of the pot. the 

 growth in open fj;round being far in excess of tliat of the ])ot-grown j)l.ints. 



An experiment was also conducted with coleus and heliotrope plants, one por- 

 tion of each being planted in pots of 7, i), 12, and 15 cm. in diameter, respectively, 

 while the other portion was repotted successively from the smallest to the larg- 

 est of these pots. In every case, with the exception of the heliotrope growing in 

 the pot "7 cm. in diameter, the average repotted plant weighed less than the 

 plants started in their permanent position. A further experiment api)ears to 

 show that the greater the number of repottings the smaller is the development of 

 the resulting plant. 



FORESTRY. 



Forest planting leaflets ( f. .s'. Dcpt. Am'., Forest Serv. Circs. 76, pp. 3; 

 77. pii. '/.• ,s'i. pp. S; SS. pp. .i; .s'}. •/>/). '/ ; S.l. pp. // ; ,S'C, pp. 3; 87, pp. Jf,- 88, pp. 5; 

 89, pp. 'i; HO. pp. 3; 91, pp. ', : 9.1, pp. .', : 9,3, pp. J,; 9//, pp. 3; 9,5, pp. //).— These 

 leaflets treat of the form and size, habits and growth, economic uses, methods of 

 propagation, pl.-inting, cultivation, and care of the following species of trees, 

 which are given in order corresponding with the circular numbers above: 

 Silver maple (Acer sdccharlniun), cottonwood {Populus deltoides) . hardy 

 catalpa {Catalpa .spcviosu), Russian mulberry (ilorus alha tatariea), white 

 ash (Fraxi)iiis aincricana), slippery elm {Vhmis piibesccns), bo.xelder {Acer 

 ncfiHudo), white willow {Salix alba), black walnut {Juglans nUjra), tamarack 

 {Larix laricina), osage orange {Toxyhm povtifcnuii ], coffee tree (Gi/i)niucladus 

 dioicus), green ash {Fraxiiius lunccolata), yellow poplar (Liriodcndrun tiili- 

 j>ifcra), black cherry (Pruuus serotina), and sugar maple {Acer saccliarum). 



Forest planting in Illinois, R. S. Kellogg ( V. »S'. Dept. Agr., Forest Serv. 

 Virr. 81, pp. 32, flijs. 2). — In this circular ai-e reported the results of an exten- 

 sive study of forest plantati(ms in Illinois to determine the kinds of trees best 

 adapted for planting in prairie sections. 



About two-thirds of the total area of the State was studied, although the 

 work was confined chiefly to the central and northern portions. The results 

 given are believed to be of general application throughout the State and to 

 similar situations in Indiana, Missouri, and Iowa. In all, 117 plantations were 

 visited and 22.500 trees measured. A description is given of the methods of 

 study and species studied. The important features of the studies are presented 

 in tabular form for each species, including location, age, area of plantation, 

 planting distances, number of trees per acre, tree measurements, products, 

 values, and ainiual income per acre. 



Measiu'ements were taken at the experimental forest plantation of the Uni- 

 versity of Illinois, which was jtlanted in 1871 and covei's an area of 1.3 acres, 

 containing 2(t s])ecies of forest trees. The best developed species in the planta- 

 tion ai'e European larch, white pine, green ash, and black walnut. Suggestions, 

 with accomi)anying diagriims, are given for the planting and thinning of forest 

 jiliintations and the foi-mation of shelter l)elts. 



Planting on New Mexico forest reserves, F. J. Phillips (Forestry Quart., 

 ,') (1907). \o. 1. pp. 11-19). — Suggestions are given as to suitable species and 

 methods for the reafforestation of these reserves, together with notes on their 

 present condition. The author concludes that the degree of watershed develop- 

 ment and suitable supply of forest products will determine to a great extent the 

 future prosperity of the Territory of New Mexico. 



