LAMARCKIANA SEMIGIGAS. 



691 



lans, and that for the pulla, also, auricula has been observed among 

 the mutants, although only in one individual for each. Perhaps 

 the viability for second types is the largest in this group, as it has 

 often been for scintillans itself and for its secondary forms in analogous 



16- and 



Table 8. 

 17 -chromosome offspring of Oe. semigigas. Second generation. 



Parents 



© E 

 »- © 



-I 



2-c 



Main 

 Type 



Second 

 Type 



Mutants 



2% 



s 



81 



59 



60 



55 

 77 



57 



26 

 25 



39 



39 

 13 



4 liquida 



29 pulla 



18 pulla 



51 auricula 

 21 cana 



26 cana 



42 oblonga 



4 oblonga 



5 auricula 



12 auricula 



1 albida, 1 auricula, 1 

 semigigas, 6 pu//a 



1 albida, 1 auricula, 1 

 pallescens, 2 nanella 



1 auricula, 1 semigigas 

 1 nanella 



1 albida, 2 oblonga, 8 

 nanella, 1 rubrinervis 



1 albida, 3 pallescens, 1 

 spathulata, 1 nanella 



9 



5 



3 





 12 



experiments. In experiment No. 5 eight dwarfs have been observed, 

 or about 10 percent, and this points to the condition of the parent 

 plant as that of a half-mutant for this factor, as has been discussed 

 above under the head of Oe. semigigas mut. cana. (See above p. 685). 



I have cultivated the offspring of a cross, Oe. pulla x blandina, 

 in which the female parent had also 16 chromosomes. Among 60 

 offspring, however, here also no second type was seen. There were 8 

 pulla and no mutants, the remaining 52 individuals having the 

 characters of Oe. (Lamarckiana x blandina) laeta, as was to be 

 expected. 



Among the offspring of Oe. semigigas x blandina 1 self-fertilized 

 two beautiful plants of hamata and had a second generation of 58 

 and 59 individuals, respectively. Among these, 6 and 1 1 were like 

 the parent, but 10 and 8 were cana, which might be considered as 

 a second type and thus give a corroboration of the conclusions 

 given above. There were 23 and 5 blandina-laeta and 16 and 25 blan- 

 dina, as might be expected. In the first culture there were three 

 mutants (lata, pallescens and nanella) and in the second, 10 dwarfs, 

 pointing to a condition of a half-mutant for this factor in the parent 

 plant, as discussed under the head of "cana." 



