670 Palaeontologie. — Pflanzenkrankheiten. 



Arber, from the Permo-Carboniferous of Australia while the second 

 is compared with Amucarioxylon latiporo&iirn. Kraus, from the 

 Jurassic of Spitzbergen. Dicotyledonous wood probably of lata 

 tertiary age, from the coast of Zululand is also recorded, and 

 identified with Eiigenia coräata, Laws. The method of fossilisation 

 and structure of these specimens are described and illustrated in 

 detail. W. N. Edwards. 



Butler, E. J. and A. Hafiz Khan. Some New Sugar Cane 

 Diseases. (Mem. Dept. Agric. India. VI. 6. p. 181—208. 6 pl. 

 Dec. 1913.) 



In the course of investigations on the Red Rot of Sugar Cane. 

 the authors have detected three other diseases which the}' name 

 and describe as follows: "Wilt" Cephalosporhnn Sacchari Butler sp. 

 nov.; "Collar Rot" Hendersonia Sacchari Butler gen. et sp. nov.; 

 "Helminthosporiose" Hebninlhosporhnn Sacchari Butler sp. nov. 



The first frequently accompanies Red Rot and resembles it in 

 causing reddening of the pith. It produces stunted growth and ulti- 

 mately withering of the canes and even of whole stools. Experiments 

 show that the fungus enters through wounds, uninjured root-e5^es 

 and through planted sets. The new genus Hendersonia causing the 

 second disease is characterised amongst the Phoeophragmieae in 

 possessing spores of two types in each loculus, some brown 2—3 

 celled, others hyaline, and non septate. The damage causeü by this 

 fungus is probabh' not great. In the last case {Hei mint hosporiimi) 

 it is the leaves that suffer, red spots being produced which run 

 together and form long streaks. Each disease is described in detail 

 and fulU^ illustrated, the methods of control being also given. 



A. L). Cotton. 



Juritz, C. F., Chlorosis in Orchards near Bloem fontein. 

 (Agric. Journ. Union of South Africa. IV. p. 854—865, V. p. 102— 

 112. 1912—13.) 



Records observations on chlorosis accompanied bj" general 

 lowering of vitalit5^ It is stated that in general the inability to take 

 up iron is the result of impaired vitality which may be brought 

 about by bad soil conditions or fungus diseases of the roots. 

 Amongst the former may be mentioned, excessive marliness, defec- 

 tive aeration and too large a proportion of magnesia relatively to 

 lime. In the present case unsatisfactor}^ moisture conditions and 

 the existence of an impermeable substratum of marl are largelj^ 

 responsible. The chemical character and physical conditions of the 

 soil are dealt with, and analyses given. A. D. Cotton. 



Mae Alpine, D., Handbook of Fungus Diseases of the 

 Potato in Australia. (Dept. Agric. Victoria. 215 pp. pl. 50. 1 map. 

 Melbourne 1911.) 



This volume brings together a large amount of useful informa- 

 tion concerning potato-diseases. Though largely a compilation it 

 contains also the results of a considerable amount of work by the 

 author especially in connection with the Irish Blight (Phytophthora 

 infestans) which is discussed very fully. Other diseases dealt with 



