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THE AMERICAN NATURALIST [Vol. XLVIII 



Correns 3 has reported results of a careful study of the 

 inheritance of the self-green condition appearing as a 

 bud-sport on variegated-leaved plants of Mirabilis jalapa, 

 and also of a self-color appearing in striped-flowered 

 plants of the same species. His results for self-green 

 and variegation of the leaves are shown diagrammatically 

 in Fig. 2. The results are stated in approximate per- 

 centages. I have seen no report in which the detailed 

 records were given. 



Variegated 



f. H-i rh I rh I I rS I H 



Vgtd. Green >66 <33 66 33 >66 <33 66 



SWA! i-i, , I A A J M 



The diagram shows that a variegated branch of a varie- 

 gated plant produces in F x mainly variegated plants, but 

 occasionally a wholly green plant, while a green branch 

 from the same plant produces in F 1 25 per cent, varie- 

 gated and 75 per cent, green plants. The Fj variegated 

 plants, however produced, behave in later generations 

 just like the original variegated parent plant. The F, 

 green plants, whether produced from green or variegated 

 branches, are always of two sorts, namely, those that are 

 homozygous and therefore breed true green, and those 



8 Correns, C, Ber. Deutsch. Bot. Gesel., 28: 418-434, 1910. Der Uber- 

 gang aus dem homozygoiischen in einen Tieterozygotischen Zustand im selben 

 Individuum bei buntblattrigen und gestreiftbliihenden Mirabilis-Sippen. 



* Numerals indicate approximate percentages; a =0-10 per cent. 



