Varietäten etc. — Physiologie. 37 



je ein Schwärmer einen Typ liefert. Bei der Reduktionsteilung muss 

 also eine Neukombination der Eigenschaften stattfinden. 

 Eine ausführliche Arbeit wird in Aussicht gestellt. 



G. V. Ubisch (Berlin). 



Reinke, I., Bemerkungen zur V ererbung s- und Abstam- 

 mungslehre. (Ber. deutsch, bot. Ges. XXXIV. H. 2. p. 37— 66. 1916.) 



Verf. stellt sich die Frage, ob die Gene corpuscular oder 

 dynamisch zu denken seien, wägbar oder imponderabel und kommt 

 im Gegensatz zu Nägeli (Idioplasma) und Weismann (Determinan- 

 ten, Iden, Idanten u. s. w.) zu dem Schluss, das sie dynamisch sind. 

 Er kritisiert einige in der Vererbungslehre übliche Ausdrücke und 

 Definitionen unter folgenden Ueberschriften: Artbegriff; Ontogonie; 

 Isogonie (Geschlechtliche Fortpflanzung bei strenger Inzucht); Wie 

 sind Gene zu denken? Korpuskularhypothesen; Die Reaktionsweise 

 der Gene; Genotypus und Phaenotypus; Allogonie (Mutation); 

 Phylogonie; Anpassung und natürliche Auslese. Zum Schluss gibt 

 er noch eine kurze Inhaltsangabe eines vor der 83. Versammlung 

 der British Association for the advancement of science Birmingham 

 1913 gehaltenen Vortrags über die Grundlagen des Lebens. 



G. V. Ubisch (Berlin). 



Bouyoucos, G., Transpiration of wheat seedlings as af- 

 fected by different densities of a complete nutrient 

 Solution in water, sand and soll cultures. (Beih. bot. 

 Cbl. 1. XXIX. p. 1-20. 3 fig. 1912.) 

 The transpiration per gram of dry matter of wheat seedlings 

 grown in Solution, sand and soil cultures containing 4500, 2250, 

 750, 375, 137,5, 93,5 and P.p. m. respectively of a complete nu- 

 trient Solution, increased in every case with the decrease in density 

 down to a certain point and then decreased with the further dimi- 

 nution in concentration, while the actual dry matter produced in- 

 creased with the rise in density. This general run of the relative 

 transpiration was explained thus: The increase from the highest 

 concentration to that where the change occurs, was thought might 

 be due to the decreased osmotic pressure of the Solution and to 

 the decreased density of the cell sap; while the decrease from 

 where the change occurs to the lowest density, was believed might 

 be due to the decreased stimulative action of the dilute Solutions. 

 The relation of the density of the Solution to that of the plant cell 

 sap was tested experimentally and it was found that the density 

 of the latter increased with the concentration of the former. The 

 relative transpiration was greater in the sand and soil cultures than 

 in the Solution cultures receiving the same densities of the Solution, 

 and greater in the soil then in sand cultures; while the actual dry 

 matter produced was larger in the Solution than in the sand or soil 

 cultures and larger in the sand than in the soil cultures. 



Matouschek (Wien). 



Harris, J. A., Observations on the physiolog}'^ of seed 

 development in Staphvlea. (Beih. bot. Cbl. l. XXVIII. p. 1 — 16. 

 1 textfig. 1912.) 



Author gives the results of analysis for 3 series comprising alto- 

 gether over eight thousand fruits of Staphylen trifoUa. The purpose 

 of the work is to ascertain something concerning the internal fac- 



