408 Physiologie. 



ANONYMUS. Chlorosis in Palms. (Gard. Chron. London. 

 1902. XXXII. Ser. 3. p. 232.) 



A short abstract from an article in the „Bulletin de la 

 Societe royale de Botanique de Belgique", by M. Laurent, 

 in which the phenomenon is attributed to fatly degeneration of 

 the Chlorophyll corpuscles. B. Daydon Jackson (London). 



BlFFEN, R. H., Note on some Grafting Experiments. 

 (Annais of Botany. Vol. XVI. No. 61. March 1902. p. 174.) 



The author was successful in grafting the iollowing plants: 



1. Varieties of Beta vulgaris; Sutton's Mammoth Long Red, 

 Sutton's Yellow Globe, Sutton's Tankard, the Kleinwanz- 

 lebener sugar-beet, and the crimson beet. 



2. Tropaeolum majus and T. canariense. 



3. Varieties of radishes ( Raphanus Raphanistrum). 



4. Brassicas; Kaie on Drumhead Cabbage, Broccoli on Cabbage, 

 Brüssels Sprout on Cabbage, Kohl-Rabi on Kaie, and vice 

 versa in each case. 



5. Leguminosae ; Trifolium repens on T. pratcnse and T. hybridum, 

 T. pratense on T. repens and T. hybridum, and T. hybridum on 

 T. repens and T. pratense: Medicago sativa on T. pratense, and 

 T. pratense on Anthyllis Vullneraria. 



In no case was there any visible sign that scion and stock affected 

 one another. The author confirms Daniel's results (Ann. Sei. Nat. 

 1898. p. 1) that the effect of grafting is often to dwarf the plants, to retard 

 their flowering season, and in some cases to render them more liable to 

 the attacks of animal pests. 



In a series of experiments with potatoes (Solanum tuberosum) indi- 

 cation of a mutual effect between scion and stock was observed. A 

 variety of tubers A was grafted on another variety B, and similarly B 

 on A. The resulting crops consisted of tubers of the types A and B, 

 and also of tubers of which one end (the distal) resembled A, whilst the 

 other (proximal) end resembled B. 



Such composite tubers have long been recognised as typical „graft- 

 hybrids": but it must be remembered that if divided transversely, each 

 half is indistinguishable from one of its parents, and that the tuber itself 

 shows all the characteristics of its parent and not only certain dominant 

 ones: hence the graft-hybrid is not comparable with the sexually produ- 

 ced hybrid. Vines (Oxford). 



Ate CALLUM, W. B., On the nature of the Stimulus 

 causing the change of form and strueture in 

 Proserp inaca palustris. (The Botanical Gazette. XXXIV. 



Aug. 1902. p. 93—108.) 



The Variation in the strueture of the submerged and aerial 

 organs, especially of the leaves, is described, together with 

 experiments for determining the factors concerned. The 

 author concludes that „the only factor which is constant in all 

 cases where the waterform develops is the checking of 

 transpiration and the consequent increased amount of water in 

 the protoplasm." The paper is illustrated by ten figures in 

 the text. Campbell. 



