82 Morphologie etc. — Varietäten etc. 



Stoffwechsel am regsten ist, erfolgt auch die Substanzabgabe des 

 Kernes an das Plasma in der ausgiebigsten Weise. Verf. ist der 

 Ansicht, das eine solche Substanzabgabe nur beim Fehlen einer 

 Kernmembran möglich ist. Näheres über die Einzelbefunde ist 

 im Original selbst nachzusehen. Lakon (Hohenheim). 



Punnett, R. C, Reduplication series in Sweet Peas II, (Journ. 

 of Genetics. VI. p. 185—193. 1917.) 



The present note is supplementary to an earlier paper in the 

 Journ. of Genetics (III 1913. p. 77) and relates to the BEL series 

 [Bzz: blue, E =1 erect Standard and L = long pollenj. 



1. The relation between E and L in plant homozygous for B or b 

 was undecided. The present series of experiments show that, from 

 a mating of the form EL and el, reduplication ratio is 7 : 1 : : 1 : 7. 



2. Some more F^ numbers can be added to the colour-pollen 

 series homozygous for E or e of the former paper. Adding all the 

 data together the reduplication ratio of 7 : 1 : : 1 : 7 between B and L 

 is indicated closely. 



3. Additions can also be made to families heterozygous for all 

 three factors B, E and L. Where the mating was of the form 

 BEL and bei, the relations of each pair of factors considered sepa- 

 rately is («) between B and L, 7 : 1 : : 1 : 7 ((?) between B and E, 

 63 : 1 : : 1 : 63 (y) between E and L, 7 : 1 : : 1 : 7. 



4. Larger numbers are also available for Be L, b E 1 cross Which 

 suggest a 10 : 1 : : 1 : 10 series. The author is inclined to believe that 

 there is some as yet undetected cause disturbing the 7 : 1 : : 1 : 7 ratio 

 and is carrying out further experiments to determine this point. 



The present facts are equally well explained on either the 

 chromosomal „crossing-over" hypothesis as on Trow's reduplication 

 hypothesis. 



The „linkage" values of this particular series are regarded as 

 too high to be satisfactorilj^ employed to differentiate between the 

 hypotheses but attention is drawn to the series occurring in Pri- 

 mula between magenta flower-colour (M), short style (S) and green 

 Stigma (G), where the reduplication ratios are much lower. 



W. Neilson Jones. 



Saunders, E. R„ Studies in the inheritance of double- 

 ness in flowers. II. Meconopsis, Althaea and Dianthus. (Journ. 

 of Genetics. VI. p. 165—184 1917.) 



The Stock occurs as a Single or fully double with no interme- 

 diate forms. Wallflower is probably similar although a new strain 

 of doubles has recently been introduced in which all stages of dou- 

 bleness occur and fertility is retained. The doubling in this case is 

 however in quite different lines. 



The three genera of the title differ from Stock in that all 

 degrees of doubleness and sterility occur. 



Meconopsis Ciimbrica. History and morphology of the doubleness 

 is given, together with a füll account of breeding experiments. 



The conclusions given are: 1. doubleness is due to petalody of 

 stamens and ovar3\ 2. Varying degrees of doubling occurs. 3. The 

 extreme form of double is sterile. 4. Doubleness behaves as a 

 dominant and doubles are obtained only from the seed of doubles. 

 5. Singles are pure recessives. 



