Fungi, Bacteria und Pathologie. 43 



ends before the pseudoplasmodium condition begins. The latter 

 therefore is a phenomenon connected not with Vegetation 

 but with fructification, and is by no means homologous with 

 the plasmodium of true Myxomycetes, nor is it comparable 

 in the Ieast to the vegetative net - plasmodium of the 

 Labyrinthuleae. The spindle-shaped individuals of the Labyrin- 

 thuleae, in the authors opinion, do not present close resem- 

 blances to the amoeboid individuals of the Acrasieae either in 

 their structure or in their peculiar mode of Iocomotion, and it 

 follovvs that the structural resemblance in these two groups 

 does not Warrant placing the Labyrinthuleae between the 

 Acrasieae and the Myxomycetes. 



After a brief historical summary of previous investigations 

 of the Acrasieae, the results in detail are given of careful 

 studies on the developmental history of four genera, namely, 

 Sappin ia, Guttulinopsis, Dictyostelium, and Polysphondylium . 

 there follows a füll discussion of the comparative ontogeny of 

 these genera, and of the possible phyllogeny of the Acrasieae. 

 At the close is a scientific description of the genera and of the 

 species studied under each, followed by a list of references 

 to the litterature consulted in the preparation of the mono- 

 graph. G. G. Hedgcock. 



ORTON, W. A., S o in e Diseases o f the Co w p e a. Parti. 



The Wilt Disease of the Cowpea and its eontrol. 



(Bulletin No. 17, Bureau of Plant Industry, United States 



Department of Agriculture. April 1902. p." 1— 22. pl. 4.) 



This bulletin contains the results of the continuation oi the in- 

 vestigations conducted by Dr. E. F. Smith the results of which are given 

 in Bulletin No. 17 of the Division of Vegetable Physiology and Pathology. 

 The disease and its cause (Neocosmospora vasin fectans, var. tracheiphila 

 Erw. §m.) are described. The manner of infection of the host by the 

 fungus and the life history of the latter is briefly reviewed. The relation 

 of this disease to other wilt diseases is pointed out. Its distribution is 

 not yet widespread, but it is liable to become in any season a great 

 cause of injury to the cowpea crop. Three means of prevention are 

 offered, viz., the rotation of crops, the Substitution of other leguminous 

 crops not subject to the disease, and the planting of varieties of the 

 cowpea not seriously affected by the fungus. In the latter case the 

 variety known as the Iron pea succeeds well in infected soils, and is 

 recommended for planting. Hedgcock. 



TliRQUET, J., N o t e sur u n tionveati p r o c e d e d e c u 1 1 u r e s 

 cellulaires enmycologie. (Comptes rendus de Biologie. 

 Paris 21. nov. 1902. t. LIV. p. 1256—1258.) 



L'auteur remplace la cellule ordinaire par une petite boite 

 de Petri couverte par une plaque porte-objet portant la goutte 

 pendante. Cet appareil est facile ä steriliser. Apres une germi- 

 nation de 6 ä 12 heures on voit ä l'oeil nu les jeunes colonies 

 de Champignon et i'on peut aisement, ä l'aide d'une aiguille 

 flambee, les enlever toutes moins une. On a ainsi une culture 

 issue d'une spore unique. Paul Vuillemin. 



