7. Kestitutionslehre. 8. Abstammungslehre. 609 



1679) Shaw, J. A., A System of recording Mendelian observations. 



(Amer. Nat. 45. p. 701—704. 1911.) 

 A method of facilitating record-keeping by the use of Cards in which 

 the characters can be systematically recorded. Gates (London). 



7. Restitutionslehre. 



1680) Huxley, J. S. (Oxford University), Some Phenomena of Regene- 

 ration in Sycon; with a note on the structure of its collar cells. 



(Phil. Trans. Royal Soc. B202,B286. p. 165—189. 1 plate. 1911.) 

 Single-cells and small groups of cells of the sponge were isolated; when 

 put together these cells united together by means of amoeboid cells into small 

 masses. These reorganised themselves as does the sponge-larva after settling, 

 and proceeded to develop into small sponges. If however only collar-cells 

 were included in the masses formed by union, no complete regeneration of the 

 sponge took place. Doncaster (Cambridge). 



1681) Daniel, L., Sur quelques procedes anormaux d'affranchisse- 

 ment des greffes ordinaires. 



(Compt. Rend. Acad. des Sc. de Paris 154,16. p. 37—38. 1912.) 

 L'auteur a etudie avec soin diverses greffes de Composees, de Cactöes et 

 de Solanees. II a pu mettre en evidence la presence de bourgeons adventifs 

 du sujet penetrant dans le greffon, et de racines adventives du greffon pou- 

 vant penetrer tres profondement dans le sujet. C. L. Gatin (Paris). 



8. Abstammungslehre. 



(Siehe auch Nr. 1524, 1552, 1559, 1562, 1564, 1577, 1594. 1599, 1600, 1609, 1611.) 



1682) Hus, H., The origin of species in Nature. 



(Amer. Nat. 45. p. 641—667. 1911.) 



This paper brings together and discusses a number of interesting cases 

 of the occurrence of new forms or mutants in the wild condition. Many of 

 these have since given rise to races which breed true. Certain ones, such as 

 Oxalis stricta viridiflora, were first observed in culture and have since 

 been found as a wild dement of the flora. In many cases the new forms 

 differ from the previously known species in a Single character and are known 

 as varieties. Such is the inermis variety of Cynara Cardunculus. But 

 such forms as Capsella Heegeri, which differ in several respects from the 

 original or parental type, are accorded specific rank. In both the last-named 

 cases there is a possibility of the independent origin of the same form in at 

 least two widely separated localities; the former in Algiers and Buenos Aires, 

 the latter in Germany and Michigan, U. S. A. 



An interesting laciniate variety of the burdock, Arctium minus, has 

 been collected in ten localities in the United States, and some of these may 

 have been of independent origin from the parent species. The wheat-ear car- 

 nation, Dianthus Caryophyllus imbricatus, has appeared at various 

 times, and since it cannot produce seeds, this must furnish a case of repeated 

 mutation. Numerous other cases of a similar sort are cited in this paper. 



Gates (London). 



Zentralblatt f. allg. u. exp. Biologie. II. 41 



