X7D -■ '^'l^^^ ^^^- '\WirE:BOTA^lG^L MA€fAZ[NE>J:s.KT[^^{^^^ xxV:;NA,r2i>4. 



"v^v-ere SO seldom to be met with, that iliia^eF^ot only tw5^ subk 

 preparations. All the other flowers; '^collected from the oth^ir 

 individuals always showed the normal course of development 

 of their pollen grains. So it seems; to me that these abnor- 

 mities are not constant peculiarities of ^Amber rice pop corti-' 

 and as there is no indication of the hybrid nature in the 

 normal case of this plant, it is probably safe to conclude that 

 this abnormal case has nothing to do with hybridization. 

 TisCHLER has expressed a view in his study of Musa (10) : 

 " Stoffwechselstorungen in der Zelle miissen wir wohl auch fiir 

 unsere Abnormitaten bei den Reduktionsteilungen heranziehen. 

 Yielleicht erlauben die Aussenbedingungen nicht, dass geniigend 

 Chromatin gebildet wird, vielleicht, dass nicht in hinreichendem 

 Masse des ))Tropho((plasma zur Spindelfaserbildung aktiviert 

 wird oder ahnliches mehr." It is to be noted in my case that 

 the chromosomes are thinner than the normal ones and the 

 spindle fibres do not develop so well as in the normal case. 

 So far it is in accordance with Tischler's view. This is 

 strengthened by the fact that among the plants from which I 

 have collected the materials there were some individuals of very 

 bad growth. In my previous paper on a cytological study of 

 Oryza sativa (2) I have found incidentally an abnormal case in 

 the heterotype division in which the chromosome were thinner 

 than the normal and the spindle fibres were in the bad state of 

 development. I am, at present, inclined to believe that that 

 was also due to the insufficient nutrition of the plants. 



* Black Starch.' 



This race, which has no horny endesperm, was also found to 

 show 10 gemini in the heretotype division. 



' Golden Broach Field Corn.' 



This is a race characterized by the indentation caused by 

 the shrinkage of the starchy matter in drying. The color of 

 the kernel is j^ellow. The number of gemini of this race is 

 also 10 as in the foregoing cases. 



