Descendenz u. Hybriden. — Morphologie. - - Physiologie. 37 



Harsberger, J . W., A study o f t h e f e r t i 1 e h y b r i d s p r o - 

 duced by crossing teosinte and maize. (Publications 

 of the University of Pennsylvania, n. s. VI. 1901. p. 231 

 235. pl. 22.) 



Referring to hybrids of Euchlaena Mexicana pollinated by Zea Mays t 



which constitute the Zea canina of Watson. Trelease. 



Clshman, J. A., S t u d i e s o f I o c a 1 i z e d s t a g e s o f G r o w t h 

 in some common New England Plants. (Amer. Nat. 

 XXXVI. p. 865—885. pl. V. ' Nov. 1902.) 



A study of the early iorms of leaves in the spring growth 

 of a number of New England plants, mostly herbaceous, with 

 a comparison with the early leaves of the seedlings. The author 

 assumes that these early, simple leaves represent primitive 

 forms of leaves, which occurred in the adults of the ancestors 

 of the existing species. The forms studied are Viola peclata, 

 Chelldonlum majus, Aquilegia Canadensis, Ranunculus acris, 

 Tanacetum vulgare, Viola tricolor, and Rosa rubiginosa. Brief 

 references are also given to a number of other species. 



D. H. Campbell. 



Bain. S. JH., A simple method for demonstrating the 

 translocation of starch. (Univ. of Tennessee. Record V. 

 1902. p. 259—262.) 



In the course of experiments upon the influence of copper 

 on starch production in leaves, a simple method for demon- 

 strating the translocation of starch was discovered. This is as 

 follows: place small drops of 3 °/o copper sulphate Solution upon 

 vigorous, mature leaves of plum or peach growing under nor- 

 mal conditions. Let these leaves remain attached to the stein, 

 and gather, at intervals, on successive days, until the affected areas 

 are ready to drop out of the still living leaves. Put these leaves 

 in alcohol. A rapid cell division will be found to have taken place 

 at the margin where an affected area has dropped out. A very 

 distinct zone of starch accumulation will be found forming, to 

 furnish the material for the new cellwalls. Comparison shows 

 clearly that the starch has moved radially in both directions 

 toward this zone of accumulation, the experiment shows: 

 1., the demand for plastic material where rapid cell division is 

 taking place; 2., the accumulation of starch at this region; 

 3., the region from which as well as the region toward* 

 which this translocation has occurred. p. Spaulding. 



Cavara, F., R i c e r c h e crioscopiche s u i v e g e t a I i. 

 (Extr. des Rendiconti del Congresso botanico di Palermo, 

 Maggio 1902.) 



L'auteur a applique la methode cryoscopique ä la deter- 

 mination de la pression osmotique chez les vegetaux. II s'est 

 servi de l'appareil de Beckmann, tantöt avec morceaux de 



