1907] CURRENT LITERATURE 



463 



perature 



the limiting factor, while in Dendrocalamus sometimes the water supply, some- 



temperature 



be 



water supply by day and temperature by night; in Vitis the temperature in 

 January, and the water supply in July. The paper is a most suggestive one. 



study along this Hne.— C. R. B. 



can 



Infectious chlorosis- — Baur^? reports that the variegated forms of Ligustrum 

 vulgare, Liburnum vulgare^ Fraxinus pubescenSy Sorbus aucuparia^ and Pteka 

 trifoliata^ which are propagated by cuttings, owe their yellow or variegated leaves 

 to an infectious chlorosis like that recently described in detail for Abutilon Thomp- 

 soni, A yellow variety of Ptelea trifoliata, however, which can be grown from 

 seed, is a true aurea-iormj and its condition is not transmissible by infection. 

 Baur expects to find this disease widespread, when time avails for examining 

 the many wild and commercial variegate -leaved plants. He intends to make 

 his next task the isolation of the problematic infecting material. — C. R. B. 



primary uredospore. — Christman 



primary uredospo 



He 



aecidium 



spores 



The relation of 



these results to the life-history as a whole is presented in a later paper published 

 in this journal. '9_j. M. C. 



Anaerobic 



collaborators^'^* report 



enzymes 



carbohydrates in plant ce 

 Zymase is responsible for the lactic acid; lactacidase for the alcoholic fermentation, 

 with hydrogen as a by-product. This seems indirectly to support Pollacci's 

 hypothesis that in photosynthesis we have reduction of CO3 by H.— C. R. B. 



^7 Baur, Erwin, Ueber infektiose Chlorosen bei Ligustrum, Laburnum, Fraxi- 

 nus, Sorbus, und Ptelea. Ber. Deutsch. Bot. Gesells. 25:410-413- ^907- 



^8 Christman, A. H., The nature and development of the primary uredospore. 

 Trans. Wis. Acad, Sci. 15:517-526. pi. 2g. 1907. 



^p Christman, A. H., Alternation of generations and the morphology of the spore 

 forms in rusts. Box. Gazette 44:81-101. ph 7. 1907. 



Stoklasa. Ernst 



Atmungsenzjmi' 



Ber. Deutsch. Bot. Gesells. 



25:122-131. 1907. 



