Morphologie etc. — Varietäten etc. — Physiologie. 355 



omitted from the reformed nucleus in either the heterotypic or 

 homotypic divisions, 



The poUen grain grows to a large size, the nucleus may or 

 may not divide, and the cell then vacuolates and goes to pieces 

 leaving only the outer coat shrivelled and cracked. 



Such somatic mitoses that have been observed show a long 

 Blender chromosome, whereas the germinal cells possess a short 

 broad chromosome. Jongmans. 



Harris, J. A., On the distribution and correlation of the 

 sexes (staminate and pistillate flowers) in the inflo- 

 rescence ofthearoids Arisarum vulgare ^.n 6. Arisarum pro- 

 boscideum. (Bull. Torrey Botan. Club. XLII. p. 663—673. 1915.) 



In both A. vulgare and proboscideum, the coefficient of Variation 

 for number of pistillate flowers is far higher than that for number 

 of staminate flowers. The interpretation of this result presents con- 

 siderable difficulty. 



In A. vulgare the inflorescence not only produces a larger 

 number of both staminate and pistillate flowers than does that of 

 A. proboscideum j but shows a far higher variability, both absolute 

 and relative. 



The inflorescence of A. vulgare is not only more variable, but 

 shows a higher degree of correlation of its parts than does that of 

 A. proboscideum. In both cases the correlation between number of 

 staminate and pistillate flowers is rather small. 



The correlation between the total number of flowers produced 

 by the inflorescence and the number of staminate flowers is neces- 

 sarily positive and high. The correlation between the total number 

 of flowers and the deviation of the staminate flowers from their 

 probable value, on the assumption that the character (sex) of the 

 flowers is independent of the size of the inflorescence, is signifi- 

 cantly negative. This shows that the larger inflorescences have 

 relatively more pistillate flowers. Jongmans. 



Heckel, E., Sur le Solanum, Caldasii Kunth {S. guaraniticum 

 Hassler) et sur la mutation gemmaire culturale de ses 

 parties souterraines. (C. R. Ac. Sc. Paris. CLX. p. 24—28. 

 1915.) 

 Cette esp^ce s'est montr^e ä la culture comme capable de varia- 

 tions multiples et partielles, tout en ne mutant pas jusqu'ä cette 

 annee. L'auteur a observ^ des variations dans les pedoncules flo- 

 raux, les foliolules supplementaires, les fruits et encore dans les 

 tubercules. Un seul pied a produit huit tubercules dont cinq sau- 

 vages et violets, petits, spheriques ou ovales, mais portes par de 

 longs stolons et couverts de lenticelles saillantes. Les trois autres 

 sont ovoides, jaunes avec taches violettes discretes, yeux saillants, 

 plus de stolons, plus de lenticelles saillantes, peau fine et lisse, 

 tous les caract^res des tubercules mutes et comestibles. 



Jongmans. 



Bobilioff-Preisser, W., Beobachtungen an isolierten Palli- 

 saden- und Schwammparenchymzellen. (Beih. bot. Cbl. 

 1. XXXIII. p. 248—274. 1916.) 



Verf. kultivierte durch Abschaben isolierte Zellen auf dünner 



