FOEESTRY. 



247 



son of 1899. A difference of 34 days was observed between the earliest and latest 

 varieties starting into growth, when all varieties were considered. With French 

 varieties alone a difference of 22 days was observed. 



Wliat grapes are best as pollenizers, F. H. Hall and S. A. Beach {Nnr Vnrk 

 State Sta. Bui. l'!0, piijiiilar ed., }>}>. o). — This is a popular e(htion of Bulletin 169 of 

 the station (see p. 240). 



Systems of grape pruning in the Mediterranean region, L. Ravaz {Ann. 

 EcuJe Nat. Agr. MontptWer, 11 {1899-1900) , j)p. 315-328).— Mier considering com- 

 paratively and physiologically a number of different systems of grape pruning, the 

 author believes that with the vines, soils, and climate of the Mediterranean region 

 the older method of short pruning on low stocks is to be preferred to later methods 

 of long pruning, since more wine of a better quality is obtained. 



On the quantity and quality of the products of the vine, L. Ravaz {xinn. 

 Ecole Xat. Agr. Moutj»'Jlin; 11 {1899-1900), pp. 339-333).— Theoretival considerations 

 on increasing the (luantity while maintaining the quality of vine products. 



The growing of herbaceous Calceolaris, W. Kleinheinz {Amer. Gard., 21 

 {1900), No. 289, pp. 455, 456, fig. 1). — Cultural directions. 



The clematis {Amer. Gard., 21 {1900), No. 293, p. 5f 2). —Historical and cultural 

 notes, with remarks on hybridizing and on diseases and insects. 



How to grow lilies, J. McGregor {Amer. Gard., 21 {1900), No. 292, p. 504). — 

 Short paper covering time of potting the bulbs, removal to the house, temperature, 

 etc., read by the author before the Pennsylvania Horticultural Society. 



The history of the rose {Jour. Hort., 52 {1900), Nos. 2697, p. 478; 2702, p. 34; 

 2706, p. 132). — The early history is dealt with especially. 



Chronolog-ical contributions to the history of the sweet pea {Amer. Gard., 

 21 {1900), No. 292, p. 501). — Historical notes on the sweet pea, beginning with its 

 introduction into England from Italy in 1696 and coming up to the present. 



Nicholson's dictionary of gardening'. Supplement, G. Nicholson {Hyde 

 Pa7-Jc, M(i.s.s.: G. T. King, 1900, pp. 376,figf<. 385). — This work supplements the au- 

 thor's dictionary of gardening, bringing the matter up to date as far the letters A-F. 



FORESTRY. 



The density of forest crops, W. Schlich {Gard. Chron.^ 3. ser.., 

 27 {1900), ^o. 705, pp. Ji.lJi.-Ii.16). — The author undertakes to answer the 

 question as to the proper density of forest crops at which the fertility 

 of the soil is preserved, if not increased, and the most valuable class 

 of timber produced. The results of thousands of measurements are 

 given of Norway spruce, beech, oak, and Scotch pine, in which all 

 kinds of soils are considered. The average results are given in the 



following table: 



Density of foreat crops. 



Age of wood. 



20 years . 

 30 years . 

 40 years . 

 50 years . 

 60 years . 

 70 years . 

 80 years . 

 90 years . 

 100 years 

 110 years 

 120 years 



Number of trees to the acre. 



2,800 



2,000 



1,380 



1,020 



660 



490 



400 



330 



290 



260 



250 



Beech. 



2,800 

 1,790 

 1, 150 

 770 

 560 

 440 

 330 

 260 

 220 

 190 

 160 



Oak. 



2,700 

 1,140 

 640 

 420 

 310 

 240 

 200 

 160 

 140 

 120 

 105 



Scotch 

 pine. 



1,900 

 1,250 

 850 

 620 

 460 

 360 

 290 

 240 

 200 

 180 

 160 



