Landwirtschaftliche und forstliche Biologie. Fischerei. 381 



It is considered that in the evolution of the parasitic habit, the fungus has 

 evolved tissues wliich are not destroyed by the enzyraes secreted to dissolve the 

 tissues of the host, while conversely an enzyme which will destroy the fungus 

 mycelium is likely to leave the host plant untouched. Hence, knowing that a 

 strong enzyme is present in the fruit bodies of Coprinus, a water extract of these 

 bodies was injected hypodermically and also applied to the external fruit bodies 

 of the Stereum. The result was that the fungus was checked and the disease 

 of the tree at least partly cured. Gates (London). 



1 185) Eriksson, Jacob, Etudes surla maladie produite par laRhizoctone 

 violacee. In: Revue g. de Bot., Bd. 25, Heft 289, S. 14—31, 1913. 



Le EJiizodonia violacra est un Champignon sterile produisant une maladie 

 qui apparait sur les organes souterrains d'un grand nombre de vegetaux tels 

 que les carottes, la betterave et un grand nombre d'autres especes tres eloignees 

 les unes des autres au point de vue systematique. 



Des essais d'inoculation, effectues par l'auteur, montrent d'autre part que, 

 Selon toute vraisemblance, ce Champignon tend ä former des races specialisees 

 sur chaque espece. Sur les tubercules ou les racines souterraines, ce Champignon 

 presente l'aspect d'un feutrage de couleur souvent violacee, et produisant des 

 sclerotes. La forme fertile se produit dans le cas de la forme croissant sur la 

 carotte sur une autre plante, teile que Galeopsis tetrahit, Urtica diolca, c'est un 

 Hypoclinus produisant des basidiospores se fait le plus remarquable ressortant de 

 cette etude est la presence de deux formes alternantes vivant sur deux hotes dif- 

 ferents. C. L. Gatin (Paris). 



1186) Norton, J. B., Methods Used in Breeding Asparagns for Rust 

 Resistance. In: U. S. Dept. Agr. Dur. Plant Industry, Bull. 263, S. 1—60, 

 1913. 



This paper gives an account of the results of selection and breeding experi- 

 ments designed to produce strains of Asparagns officinalis resistant to the attack 

 of asparagus rust (Puccinia asparagi DC). A detailed account of the methods 

 breeding used is given. Numerous quantitative determinations were made and 

 their correlations of characters measured by biometric methods. No effect of 

 size of seed on germination could be detected, but the size of the individual seed 

 showed a very strong influence on the height and rate of growth, The size of 

 the young seedling is significantly correlated with the size of the adult plant. 

 The height of the plant in the fall of one year is significantly correlated with 

 the diameter of the stalk of the next year. The same plants are distinctly corre- 

 lated in respect of rust resistance in successive years. Pearl (Orono). 



1187) Quayle, H. J., Red Spiders and Mites of Citrus Trees. In: Cal. Agr. Exp. 

 Stat., Bull. 234, S. 483—530, 11)12. 



Studies of life histories of a number of species of mites, and their parasites. 



Pearl (Orono). 



1188) Yuillet, A. et J., Les insectes nuisibles au Karite. In: Agriculture 

 pratique des Pays chauds, Bd. 12, Heft 117, S. 436—449, 1912. 



Le Karite ou arbre ä beurre (Bntyrospermum parMi Kotschy) est attaque 

 par divers insectes. Dans le present memoire, les auteurs etudient les moeurs 

 et les degats causes par certains d'entre eux. 



Le grand papillon du Karite, Cirina hutgrospermi, A. Vuillet cause des 

 degats importants qui empechent les arbres de fructifier. Les cBufs de ce pa- 



