214 Morphologie etc. — Varietäten etc. 



Enfin, celle-ci s'epuise, lorsque la corpuscule est parvenu ä l'etat 

 de maturite. La naissance des corpuscules metrachromatiques s'ef- 

 fectue donc au sein des mitrochondries comme celle de l'amidon. 



„D'autres vesicuies plus grosses formees de la meme maniere 

 sur les chondriocontes ne renferment pas de corpuscules metachro- 

 matiques. Leur presence constante dans les asques, les basides, 

 etc., dans les regions de la cellule oü s'^labore le glycogene rend 

 vraisemblable de les considerer comme le siege de la formation de 

 ce produit. 



D'autre part, la presence frequente de globules de graisse dans 

 les regions de l'asque de Pustularia vesiculosa qui renferment le 

 plus de chondriocontes, et le fait que ces globules semblent souvent 

 au debut de leur formation inseres sur le trajet de ces chondrio- 

 contes porte ä penser que ces globules auraient aussi peut-etre 

 une origine mitochondriale, opinion qui est appuyee par les resul- 

 tats obtenus en Cytologie animale sur l'elaboration des graisses au 

 sein des mitochondries. 



„Enfin, nos recherches demontrent que dans G. succosa, Pesisa 

 Catinus et P. lencomelas, les grains basophiles decrits par Maire 

 dans les basides et les asques et par nous-meme dans certains 

 asques resultent d'une transformation de chondriocontes. 



Enfin suivent quelques considerations generales surl'importance 

 de ces resultats ä divers points de vue. M. J. Sirks (Bunnik). 



Baptlett, H. H., The Status ofthe Mutation Theory with 

 especial reference to Oenothera. (Amer. Natur. L. p. 513— 

 529. 1916.) 



The writer has recently observed, in several species of Oeno- 

 thera other than Oe. Lainarckiana the origin of a large number of 

 different mutations. The remarkable fact about one of these muta- 

 tions, viz. those of Oe. pratincola, as far as work with themhasgone, 

 is that their crosses with the parent species are identical with the 

 pistillate parent in the first hybrid generation. Mutation poUinated 

 with parent species yields mutation; species poUinated with mutation 

 yields species. 



This most interesting State of affairs is absolutely at variance 

 with the attempted Mendelian explanation. It can be understood on 

 the supposition that two types of gametes are produced, which are 

 by no means equivalent. One type bears most of the characters 

 which differentiate the different species and forms from one another. 

 The other type seems to carry characters which are likely to be 

 common to a number of different species. In the species Oe. pratin- 

 cola the gametes of the form-'^r class are female, those ofthe latter, 

 male. Thus it foUows that a mutative modification of the germ 

 plasm in one of these species might affect only characters which 

 were borne by one of the two kinds of gametes. If so, we would 

 have at once a simple explanation of the behavior of the mutations 

 which give matroclinic crosses with their parent species. 



The same idea may readily be extended, according to the 

 writer, to cover the cases of mutations which give progenies con- 

 taining both the mutational and the specific types. Perhaps the mu- 

 tative change is a reversible one, and certain gametes in eachj 

 generation show reversion from the mutated to the unmutated con- 

 dition. Or perhaps in some species there are male and female ga- 



