732 7. Restitutionslehre. 



type. Experiments with both plants and animals are being carried on in 

 order to test the correctness of the hypothesis. Stevens (Bryn Mawr). 



1588) Compton, R. H. (Cambridge University), On Right- and Left- 

 handedness in Barley. 



(Proc. Camb. Phil. Soc. 15,6. p. 495—506. 1910.) 

 The first leaf of a Barley seedling is folded so that one edge overlaps 

 the other, sometimes the right margin overlaps the left ("right-handed") some- 

 times the converse. An investigation of the occurrence and inheritance of this 

 character gave the following results. The ratio of lefts to rights in 'Plumage* 

 Com' (the variety most accurately studied) approximates closeby to 1-5:1 

 (60% lefthanded); in other varieties similar or slightly smaller ratios are 

 found. The twist of the last leaf below a spike has no influence on the ratio 

 of the seedlings produced by the spike. The same ratio subsists among the 

 seedlings whether from the odd or even rows of seeds, and no orderly arran- 

 gement of seedlings with respect to the twist of the first leaf could be detected 

 on the ear. The charaeters right- and left-handedncss appear not to be here- 

 ditary. Doncaster (Cambridge). 



1589) Stratum, F. J. M. and R. H. Compton, On accident in Heredily, 

 with special reference to Right- and Left-handedness. 



(Proc. Camb. Phil. Soc. 15,6. p. 507—512. 1910.) 

 The writers follow up the preceding paper by a mathematical discussion, 

 in which it is shown that it is possible to account for certain cases in which 

 Mendelian formulae do not seem to apply, if certain assumptions are made. 

 The assumptions (for the justificatton of which evidence is given) are that al- 

 though there are genetically right- or left-handed individuals which breed true, 

 yet there may be 'accidental' conversion of the body of one type to the other 

 type, although the germ-cells remain true to the genetic type. 



Doncaster (Cambridge). 



7. Restitutionslehre. 



(Siehe auch Nr. 1536, 1537, 1540, 1553.) 



1590) Nusbaum, J. et M. Oxner, O röznyni rytmie regeneracyi w 

 röznych okolicach ciala tego samego ustroju. (Spostrzezenia na 

 wstezmäku Lineus ruber Müll.) — Über die Ungleich artigkeit des Re- 

 generationsrhytmus in verschiedenen Körperregionen desselben Tieres. (Be- 

 obachtungen an der Nemertine Lineus ruber Müll.) 



(Anz. d. Akad. d. Wissensch. i. Krakau 1910. Math.-naturw. Kl. Reihe B. 

 p. 439—447. 2 Fig.) 



Schon seit längerer Zeit ist es bekannt, daß verschiedene Regionen des 

 Körpers einen verschiedenen Regenerationsrhythmus und sogar eine verschie- 

 dene regenerative Potenz besitzen können. Um aber die Frage exakt ent- 

 scheiden zu können , ob nur topographische Verhältnisse der betreffenden 

 Körperregionen oder auch Strukturunterschiede für das verschiedene Regene- 

 rationstempo maßgebend sind, muß man zwei Faktoren bei den Versuchen 

 ausschließen: die eventuelle Differenz in der Länge der betreffenden Körper- 

 fragmente und den Einfluß der Differenz in ihrem histiologischen Bau. An 

 Lineus ruber Müll, (die sog. dünne Form) fanden die Verff. ein sehr geeignetes 

 Objekt für ihre Studien. Hierbei zeigte sich, daß von Fragmenten desselben 

 Exemplars, die aus den mittleren Körperregionen am schnellsten regenerieren, 



