The problem of dimorphic plants and their fertility.
The problem of dimorphic plants and their fertility.
Thanks LA for information on sexual differences in the coloration of Amazonian fish. CD was anxious to know how the sexes differed because they are unusual in that the male has the largest share in looking after ova and young.
Asks JDH to obtain from Sven Nilsson information on whether, in reindeer species in which both sexes are horned, the horns are first developed earlier or later than in species in which males alone have horns.
The material [from F. Müller] makes the translation more like a new edition.
German entomologists are becoming Darwinists.
Reasons why the sun has been so hot recently. Thanks for the paper on the scale. Comments on this. Sends a mathematical problem.
No summary available.