500 Varietäten, Descendenz, Hybriden. — Physiologie. 



bility is that the parental characters return in later generations of 

 the hybrids because further and more complete readjustments have 

 been made. Even from the Mendelian viewpoint it is necessary to 

 recognise that the expression relations of the characters during the 

 first generation are determined by adjustment. The green-fuzz shown 

 b}^ the hybrids in question indicates that the readjustment of expres- 

 sion relations in the first generation is not confined to parental 

 characters but may involve the recall to expression of primitive 

 characters transmitted in latent form from remote ancestors. 



A somewhat similar case not without interest from a practical 

 Standpoint is shown in hybrids of Central American types of cotton 

 with the improved npland cottons of the United States. In such 

 hybrids in the first generation the lint is shorter than in either 

 pärent but in the second and subsequent generations this primitive 

 character, like the green-fuzz, is not retained but lint of longer 

 staple is produced. The short lint does not, however, disappear so 

 promptly as the green fuzz. 



This investigation goes to show that "hybrids in which unde- 

 sirable primitive characters come into expression must be grown for 

 at least two generations before selection can be applied effectivel3\" 

 The characters shoM^n by the first generation of such hybrids do 

 not afford any practical indication regarding the characters of the 

 later generations. Walter T. Swingle. 



Bralik, V., Zur Phosphorfrage im Chlorophyll. (Anz. Akad. 

 Wiss. Wien. 1908. XVI. 305.) 



Im Gegensatze zu Willstätter und in Uebereinstimmung mit 

 den einschlägigen Befunden von Stoklasa findet der Verf. auf 

 Grund zahlreicher Anal3'^sen, dass sich Phosphor stets in nicht un- 

 bedeutenden Mengen im Chlorophyll vorfindet. Unabhängig von den 

 anorganischen phosphorhaltigen Beimengungen und den farblosen 

 Phosphatiden fand Verf. das Element stets im Alkohol- und auch 

 Benzol-Extrakt grüner Blätter. Phosphor ist also wohl einer der 

 wichtigsten Bestandteile des Blattgrüns. Ausserdem fand er in dem 

 teilweise gereinigten Rohchlorophyll eine dem Cholin nahe stehende 

 Base und Glyzerinphosphorsäure. Matouschek (Wien). 



Chpistensen, P., Kemiske Undersögelser over Log i Hvi- 

 leperiodens senere Stadier. (Chemical researches of 

 bulbs in the later phases of the res fing period). (Bull. 

 Ac. roy. Sc. et Lettr. de Danemark. Copenhague. 41 pp. 1908.) 



Tulip-bulbs planted in the months of October, December, and 

 January, are growing the faster, the later they were planted. The 

 author' tries to find out the relations between growth and the 

 transformation of matter in the bulbs before planting, and he stu- 

 dies the chemical changes during growth. 



The shoots and the scales of resting bulbs and of growing bulbs 

 were analyzed separately as to their contents of dry matter, of 

 different Compounds of nitrate. of starch and other carbonic hydrates 

 and of „Pentosans". The analyses issued in the Statement that the 

 different growth-power of the bulbs is not dependent on quantitative 

 nor on qualitative differences in the food material. The slow growth 

 is not occasioned by absence of soluble Compounds, and the increase 

 of growth-power during the later period of repose is independent on 



