36 Varietäten, Descendenz, Hybriden. 



from 20 separate FjS, the glume colour was identical with that of 

 the Polish wheat. In subsequent cultures, containing at least 100.000 

 individuals, the same result was obtained. The number of plants 

 dealt with appears to be sufficiently large to Warrant the Statement 

 that in this case the grey chaff character has been totally suppressed. 



One or two other coloured forms have been crossed recently with 

 Polish wheat in the hope of finding similar cases but withoutsuccess. 



The suppression of the grey character occurring in Rivet wheat, 

 while bearing an obvious resemblance to the suppression of type 

 characters in crosses between 'rogues' and 'types' in culinary peas, 

 shows however differences that may have significance. 



In the case of the peas, the type characters in the F x plants of 

 the cross type X rogue can be detected to some extent in the 

 early stages of growth and appear to be eliminated gradually. In 

 the wheats, the differentiating character can only be apparent when 

 the plants are mature, so that this appearance of gradual elimination 

 can hardly be looked for. The author suggest that the suppression 

 of characters may be more general in wheats than generally 

 supposed. Thus, the well known examples where recessives make 

 their appearance in F 2 generations from crosses of parents showing 

 dominant characters only ha§ been explained by Nilsson-Ehle as 

 being due to the presence of several factors producing the same 

 effect. These cases would be equally explained by the supposition 

 that one was dealing with the regulär suppression of a dominant 

 character. W. Neilson Jones. 



Crane, M. B., Heredity of types of inflorescence and 

 fruits in tomato. (Journ. of Genetics. V. p. 1 — 11. 1915.) 



All the plants grown by the author were raised from one ori- 

 ginal cross viz. „Wonder of Italy" $ X „Listers Prolific" g. The 

 inüorescences of these two varieties may be described roughly as 

 „simple" and „Compound" respectively. The fruits differ in being 

 small, elongated and bilocular in the former variety as contrasted 

 with larger, round and plurilocular in the latter. As regards inhe- 

 ritance of inflorescence form, the simple type appears to behave as 

 a simple dominant. 



The fruits of ¥ x plants were almost uniformly conicle and bilo- 

 cular, only about 5% being round and having more than two loculi. 



In the F. 2 generation, while the Compound inflorescence types 

 were very distinct from the simple, they showed considerable Varia- 

 tion among themselves. The fruit shapes were very various — 

 conical round, short, &c. If classed into „short" and „long", the 

 ratio of the two classes to one another is approximately 3: 1. 



In F 3 many more fruit shapes appeared. 



The „longs" breed true to length but not to shape: further it 

 would appear that there are two factors associated with the Shoul- 

 der of the fruit — in the absence of one the fruit is pyriform and 

 in the absence of both it is calabash shaped. 



Sterility of the anthers does not behave as a dominant charac- 

 ter as has been shown to be the case in potatoe. Thus, two plants 

 were discovered among the F 2 family with sterile anthers, parthe- 

 nocarpic fruits being eventually produced. Some of the flowers were 

 pollinated with pollen from the original $ parent and all the twenty 

 plants resulting from this cross had normal stamens. 



W. Neilson Jones. 



