DISEASES OF PLANTS. 45 



of the trees on the campus with dates when planted, character of the soil and bud- 

 soil in which they are growing, circumference of the trees in inches, height, and 

 genera] remarks <>n the character and the culture given. 



Our mountain chaparral, <i. Robertson {Pacific Rural Press, 69 [1905), No. 21, 

 /,/,. 824, 825). An account of the chaparral belts of San Bernardino, with descrip- 

 tions of the principal species of Bhrubs growing in each of these belts, and practical 

 suggestions regarding the preservation of chaparral belts. 



Layering- rubber trees, II. N. Ridley [Agr. Bui. Straits and Fed. Malay Slates, 8 

 i t904), No. li. i>i>. //'/. 442, pis. ■')• — An illustration is given of a number of rubber 



trees that have grown from the trunks of trees blown down in a storm. 



[t is recommended that trees that are blown down in storms belaid prostrate on 

 the earth and banked up along the fallen trunk about halfway and the top of the 

 tree cut off. Shoots Bpring up along the tree in abundance, but should be thinned 



out until only about 8 are left. 



Two little-kown caoutchouc-producing- lianes, E. de Wildeman ( <'<',„j,\. ll, ,,>1. 

 Acad. Sci. [Paris'], 140 {1905), No. 8, />/>. 515-517). — The author states that for a Ion- 

 time it was supposed that the caoutchouc exported in large quantity from tropical 

 Africa was obtained from a single liane, Landolphiaflorida, Recent researches, how- 

 ever, have shown that caoutchouc from L. florida is not exported by the natives for 

 this purpose. 



The caoutchouc is mostly derived from two other species, Baissea gracillima and 

 J', riploca nigrescens. The latter seems to he the more important of the two. ( laout- 

 chouc from Periploca is black and of good quality. This liane is not very large. 

 The stem is about as thick as the thumb and covered with a scaly hark. It pro- 

 duces seeds abundantly whose germination is not injured by the voyage from Africa 

 to Belgium. The plant is also easily propagated by cuttings. Sprouts from the 

 roots may he exploited commercially after 1' years' growth. 



DISEASES OF PLANTS. 



Report of the plant pathologist, E. Marchal [Bui. Agr. [Brussels'], 21 {1905), 

 No. t, pp. 73-80). — During the season covered by this report the author investi- 

 gated about 150 different plant diseases, a list of which is given. Notes are also 



given on a number of the re characteristic diseases and suggestions presented for 



their prevention. 



Report of the consulting botanist, W. Carruthers {.four. Roy. Agr. Soc. 

 England, 65 {1904), />/>. 258-269, figs. <?). — A report is given of the investigations 

 carried on by the consulting botanist for the year 1904. During this time a con- 

 siderable number of samples of grass and clover seed were examined, and species of 

 plants as well as diseases of the same were determined. 



In connection with the diseases of plants investigated, notes are given on the 

 economic habits of a number of fungi, none of which appears to he entirely new. 



Concerning the root rot of cotton, V. Mosser] {Sur "// pourridU du cotonnier. 

 Cairo: Impremerie Nationale, 1904, />/>■ -■< r /s - #)• — A description is given of the root 

 rot of cotton which has been attributed to Ozonium auricomum. The author believes 

 that the disease in Egypt is different from that in the United States: at least it is not 

 believed by him to he due to the above-named fungus as observed in Europe and 

 which is believed by many authors to bean incomplete form of some hymenomycete. 



Various methods of treatment are suggested, and among those considered most 

 promising, the author calls attention to the securing of immunity by selection of 

 plants. This is applied particularly in the case of cotton and banana, both of which 

 are subject to the disease. 



Some diseases of the potato, (h Masses {Jour. linn. Hort.Soc. [London], 29 {1904), 

 No. IS, pp. 139-145, figs. 6).— Brief descriptive notes are given of the potato rot 



