DISEASES OF PLANTS. 1053 



ill wiiicli tli(> Mullmr I'cfci's to ;i {jrcat luiinlxT (iT early writiTs on tlie subject. 

 M the l»f,i,'iiiiiiii^ uf the last (-(Mitury it was ostiniated that tli('n> were lO.OOO.OOO 

 cocoamit palms in Ceylon. TIk- author iutoiids to cover the Dutch and British 

 periods iii a later i)aper. 



A mail i^ given showini,' the loi-ation of the early cocoamit plantations in 

 ( 'e\lon. 



The Tavistock woods, \V. Scni.icii (Quart. .loin-.ForcHtrij, 1 (1!)07). No. 2, 

 I)/). l.')(>-16Ji). — This is an account of sylvicultnral work which has been con- 

 ducted in the Tavistock woods, the i>roperty of the Dnke of Bedford, during the 

 last 8 or 9 years. A general description of the forest growth, the plans for the 

 management of the woods as laid down by the author in 1898, and a summary 

 of the work actually carried out are given. The plans include the treatment of 

 oak timber areas, mixed woods, simple coppice woods, and standels. 



During the past 8 years over G20 acres Lave been stocked with various species 

 of hardwoods and conifers. 



Evergreens for the Iowa planter, A. T. Erwin and II. P. Baker (loua ,Sta. 

 Hal. 00, pp. .J6', figs. 16). — Early in the seventies the horticultural section of the 

 Iowa experiment station instituted an extensive experiment in the testing of 

 new species of evergreens to determine their hardiness and value for Iowa con- 

 ditions. This work has l)een continued from year to year and this bulletin is 

 the first report of these investigations. 



A record is given of the behavior of the more important species of evergre(jus 

 tested both at the station and throughout the State generally, together with 

 estimates of their value for the Iowa planter. Part 1 is devoted to a general dis- 

 cussion of tree growing in Iowa, and the transplanting, cultivation, and pruning 

 of evergreens. Part 2 consists of a report on species planted in the State with 

 regard to hardiness, adaptability to various soils, comparative rate of growth, 

 and general value for forestry and ornamental purposes. The groups con- 

 sidered are pines, larches, spruces, hemlocks, firs, cypresses, arbor vitaes, juni- 

 I)ers, and ginkgos. A list is given of evergreens recommended for planting in 

 different jiarts of the State under the conditions discussed, and many of the 

 s])ecies are illustrated. 



Preservation of wood used for telegraph poles, R. Nowotny {Baumate- 

 rialicnkitudc, 12 (1907), No. 5-6, pp. 65-69). — This is a comparative revievi^ of 

 the various methods and materials either used or under experiment for the 

 preser\*tition of telegraph poles both in Europe and the United States. 



DISEASES OF PLANTS. 



Report of the botanist, II. L. I'.ollk.y (Xorth Dakola Sfd. Rpt. 19ni!. pt. 1, 

 I'P. 28-36). — The principal investigations carried on by the botanist have been in 

 the study of resistance to disease in plants. An attempt was made to determine 

 whether resistance to disease is an individual chauacteristic or whether this 

 i-osistance is gained by gradual accretions from season to season. Especial 

 attention was given to the possibilities of breeding resistant races of potatoes, 

 (lax. and wheat. 



In the flax selection exiiei'iiiieiits the author lias found that ill! cultivated 

 varieties seem subject to wilt disease, but that they are not ecpially subject 

 to flax rust. In his experiments with the flax rust, and cooi)erative experi- 

 ments contlucted at the Indiana Station he found that the flax rust i)asses all 

 its different s]iore stages upon the cultivated flax. This explains the loss from 

 rust in experimental [ilats which had been devoted to flax growing for a ctm- 

 siderable number of years. The author recommends for farm practice that to 



