488 Varietäten, Descendenz, Hybriden. — Physiologie. 



plants, about 200 species belonging to 26 families. Cultures of seed- 

 lings of Querais hetevophylla show it to be a hybrid of Q. Phellos 

 and Q. rubra, while similar seedlings of Q. Budkini, supposed to be 

 Q. Phellos X Q- Marylandica, showed no evidence of being hybrids.. 



W. T. Swingle. 



Wheldale, Miss M., The Inheritance of Flower Colour in 

 Antirrhinum majus. (Proc. R. Soc. B, LXXIX. p. 288—305. 1907.) 



The inheritance of five distinct colour-types is dealt with: 

 1. White; 2. Yellow (Lips yellow, tube ivory); 3. Ivory (Lips and 

 tube); 4. Crimson (Lips crimson, tube magenta); 5. Magenta (Lips 

 and tube). In all cases the colour is sap-, not plastid-colour. 



"Delila" forms (de Vries) occur in which the tube is ivory, and 

 the lips either magenta of crimson. 



It is found that the inheritance of these aolours can be repre- 

 sented in terms of the following factors, each being the dominant 

 member or a Mendelian pair: 



Y. A factor representing yellow colour in the lips associated 

 with ivory tube-colour. 



I. A factor representing ivory colour in the lips. 

 L. „ „ magenta 



T. „ „ „ „ tube. 



The recessive members of these pairs — absence of Y etc. — 

 are denoted by y, i, etc. 



Stated in terms of these expressions the following are the main 

 points brought to light by the investigation: 



"1. All zygotes, from which Y is absent, are white, though they 

 may contain any of the factors L L, and T. 



"2. The factor T is not mar Ifested unless L is present also in 

 the Zygote; that is, no magenta colour appears in the tube unless 

 magenta colour is also present in the lips. 



"3. All zygotes containing Y are coloured. The actual colour 

 may be modified and determined by the presence of one or more 

 of the remaining factors. A Zygote containing Y only or Y and T 

 is yellow. 



"4. In presence of the factor I yellow is suppressed; a Zygote 

 containing Y and I or I, and T, is ivory. 



"5. Since magenta superposed upon yellow gives crimson, a 

 Zygote containing Y, L, and T is crimson, Y and L only, crimson delila. 



"6. Magenta superposed upon ivory gives, since the latter is 

 very pale, magenta. A Zygote containing Y, I, L, and T is magenta,. 

 Y, I, and L only, magenta delila." 



"Reversion" on crossing to the original wild (magenta) type is 

 explained by the introduction of the I, or J and L, factors by one 

 of the parents (white)." 



Details of the various crosses are given, and the paper conclu- 

 des with a discussion of de Vries' case described in the "Muta- 

 tionstheorie." R. H. Lock. 



Grube, K., Untersuchungen über die Bildung des Glyko- 

 gens in der Leber. (Archiv ges. Physiol. CXVIII. p. 1—30. 1907.) 



Aus Versuchen an Testtido Europaea (Bojanus) ergab sich, dass 

 die Leber aus den einfachen Zuckern Dextrose, Lävulose und Ga- 

 laktose, sowie aus dem Glj^zerin Glykogen zu bilden vermag. Die 

 Glykogenbildung ist am stärksten nach der Zufuhr von Dextrose, 



