634 Varietäten, Descendenz, Hybriden. 



Cuba Shade tobacco: Stewart Cuban, that gave a posterity of 

 uniform appearance and differed from the normal Cuban in having 

 leaves of a somewhat lighter green shade, in a practical absence 

 of basal suckers and in a practically indeterminate growth: in a 

 greenhouse some plants commenced to blossem about the first of 

 November, the ränge of leaf counts being from 62 to 80 leaves per 

 plant, with a mean of 70. It gave an increased 5neld of approxi- 

 mately 90%. 



Some other "mutations" in Connecticut Havana are men- 

 tined by the writer, one of which, a constantly recurring mutation 

 bore a large number of unpicked leaves, while the original form 

 produces from 14 to 25 before blossoming. From one plant, blos- 

 soming in a greenhouse during winter, 500 plants were grown , 

 which all bred true to the new habit. 



The writer believes that these mutations can hardly be explained 

 as the result of accidental crosses. These tobacco mutations seem 

 to belong to the class in which a change has taken place after fer- 

 tilization. The constantly recurring mutation in the Connecticut 

 Havana variety is of some interest from the Standpoint of periods 

 of mutation. M. J. Sirks (Haarlem). 



Marshall, C. G., Perjugate cotton hybrids. (Journ. of Here- 

 dity. VI. p. 57—64. 1915') 



The paper gives a good example of the extreme differences 

 between the F^-generation or conjugate generation, that shows 

 great uniformity and the second or perjugate generation, in which 

 an amazing diversity of forms is found, differing in size, coloring, 

 habit of growth and earliness of maturing, in leaves, involucral bracts, 

 in bolls and seeds and lintcharacters etc., good figures showing the 

 great mutiplicity of forms. M. J. Sirks (Haarlem). 



Neger, F. W., Die Reproduktionsfähigkeit der Eichen- 

 keimlinge. (Beitr. zur forstl. Samenkunde V.). (Naturw. 

 Zeit. Forst- und Landw. XIII. p. 270—271. 1915.) 



Um zu ermitteln, welchen Einfluss das bei Eicheln häufig be- 

 obachtete herbstliche Vorkeimen auf die Keimkraft hat, wurde 

 folgender Versuch angestellt: Vorgekeimte Eicheln, deren Keim- 

 wurzeln vertrocknet waren, wurden wieder zum Keimen angesetzt — 

 Keimkraft 78 '^/q (Maximum 90 « n. Minimum 68^1,,). Mit den zum 

 zweiten Mal ausgekeimten Eicheln wurde der gleiche Versuch wieder- 

 holt: Keimkraft 60 'Vo- Auch die zum dritten Mal ausgekeimten Eicheln 

 erwiesen sich — nach dem Eintrocknen der Keimwurzel — zum 

 grossen Teil Keimfähig, woraus folgt dass die Unterbrechung der 

 Keimung die Keimfähigkeit der Eichensamen nicht oder nicht 

 wesentlich beeinträchtigt. Neger. 



Southworth, W., Alfalfa hybridization. (Journ. of Heredity. 

 V. p. 448-457. 1914.) 



There is need for a strain of alfalfa {Medicago sativa L.) having 

 superior properties to any at present in cultivation, espccially in 

 its power to produce seed freely under a great variety of conditions. 

 A second problem is to try to efifect a suitable combination between 

 the hardiness of alfalfa and the fine growth of foliage and valuable 

 grazing properties of black medick {Medicago liipiUina L.) with a 



