1905] CURRENT LITERATURE 235 
the two races being: color vs. no color, and no modification vs. modification of 
the yellow color to red. Pigmentation inherited from the yellow parent and the 
modifying element inherited from the white parent are dominant, giving all red- 
flowered offspring in the first generation, and rose-yellow-white nearly in the 
ratio 9:3:4 in the second generation. 
The results were further complicated by the presence in the white-flowered 
race of a nearly latent striping which became active on crossing and behaved 
approximately as a Mendelian character. The attempt to explain this character 
on similar grounds as the red color is less satisfactory. 
Correns's has also studied the inheritance of the petaloid calyx in the caly- 
canthemus-forms of Campanula medium and Mimulus tigrinus. The calycanthe- 
mus-form of the former he finds never produces seed but has good pollen, so that 
all of the “‘hose-in-hose” Campanulas are hybrids between the calycanthemus 
and typical forms. The expected Mendelian proportion, DR XR, on the assump- 
tion that the hose-in-hose condition is dominant, is in this case 50 per cent. of each, 
and the result obtained was 44.5 per cent. to 55.5 per cent. hose-in-hose. The 
Tecessiveness of the typical form was further shown by the fact that when self- 
fertilized it produced 97.3 per cent. typical, the expected result being too per 
cent, 
In Mimulus tigrinus both male and female germ cells of the calycanthemus- 
form are functional and the question of dominance could be more completely 
tested. It was determined that here also the hose-in-hose perianth is dominant 
Over the normal. As the petaloid calyx is unquestionably a phylogenetically 
recent character, this result is the reverse of that expected from DEVRIEs’ law 
that phylogenetically older characters are dominant over newer. CORRENS 
Suggests that the “higher” character dominates over the “lower,” thus making 
EVRIEs’ law apply only to retrogressive characters; but he also calls attention 
- several cases in which the ‘“‘higher” character is obviously recessive, ¢. g., the 
laciniate leaves of Chelidonium majus laciniatus, and the yellow color of flowers 
m the cross of Polemonium coeruleum album with P. flavum. As most varieties 
ey Tetrogressive, the views of CorrENS and DeVries would equally fit the facts 
majority of cases.—G. H. SHULL. 
K. . 
moe MACKENZIE has described (idem 102-108) new species from Missouri under 
ets, Convolvulus, Dasystoma, Xanthium, and Senecio.—W. W. 
on Amer. Acad. 41:143-167. 1905) has revised the genus Zexmenia, 
15 see = ~=- 
— C., Einige Bastardierungsversuche mit anomalen Sippen und ihre 
€n Ergebnisse. Jahrb. Wiss. Bot. 41:458-484. 1905. 
