290 Allgemeines. — Biologie. 



eigenschaften („unisexuelle Kreuzungen — „sie (die An- 

 lagen) liegen im Bastard ungepaart, sie können nicht ausge- 

 tauscht werden" — während beiderseits (bei beiden Eltern), 

 aber in verschiedenen Zuständen der Activität vorhandene An- 

 lagen spaltungsfähige Bastardmerkmale geben („bisexu- 

 elle Kreuzungen"). Anders formulirt: Die Men del'schen 

 Gesetze gelten für Varietätmerkmale, während Artmerk- 

 male bei Kreuzungen constante Bastardeigenschaften liefern. 



Befinden sich die Pflanzen gerade in einer Mutationsperiode, 

 so verhalten sich die betreffenden Eigenschaften bei der 

 Bastardirung anders: „Sie befinden sich dann in einer labilen 

 Gleichgewichtslage, und deshalb können leicht Störungen ein- 

 treten." Diese Bastarde sind constant, aber in der ersten Ge- 

 neration nicht einförmig, sondern sie wiederholen beide 

 elterlichen Typen nebeneinander. Correns. 



CLEMENTS, F. E., Greek and Latin in biological nomen- 

 clature. (University Studies. [Published by the University 

 of Nebraska.] III. Dec. 1902. p. 1—86.) 



A compendium of the principles of word formation in 

 Greek and Latin, of sufficient thoroughness to enable the biolo- 

 gist to construct in proper manner any derivative desired, with 

 critical analyses of names which do not conform to the authors 

 rules. Trelease. 



Shear, C. L., The starting point for generic nomen- 

 clature in botany. (Science. N. S. XVI. Dec. 26, 1902. 

 p. 1035—1036.) 



From a consideration of descriptive work on fungi the 

 conclusion is reached that neither 1737 (the date of the Genera 

 Plantarum) nor 1753 (the date of the Species Plantarum of 

 Linnaeus), is satisfactory as a starting point for revision of 

 nomenclature; where as Micheli, in 1729 (Nova Plantarum 

 Genera), would be included if Tournefort Institutiones 

 Rei Herbariae (published in 1700) were made the initial. 



Trelease. 



Lloyd, Francis E v Vacation Observation s. II. (Torreya. 

 II. December 1902. p. 177—180.) 



Propulsion of gemmae in Lycopodium luci- 

 dulum. Expulsion of the gemmae produced by pinching the 

 gemmiparous branch at its base and exerting pressure upon 

 the leaves clasping a gemma. The maximum flight was over 

 three feet but the majority feil within fifteen inches. 



Movements of leaflets in Onoclea sensibilis. 

 A series of experiments with leaves cut off close to the ground 

 showed a decided movement due to the rapid wilting of the 

 leaf. The first part of the movement is due to a strong local 

 curvature at the base of each leaflet. 



