3. Either of these factors when present alone, whether in homozygous or heterozygous form, causes about the same degree of low fecundity to be manifested.
4. One of these factors, namely L2, is sex-limited or sex-correlated in its inheritance, in such way that in gametogenesis any gamete which bears the female sex-determinant F does not bear L2.
5. There is a definite and clear-cut segregation of high fecundity from low fecundity, in the manner set forth above.
From the standpoint of eugenics it is pointed out that these results furnish a new conception of the mode of inheritance of fecundity, and may be helpful in suggesting a method of attacking the same problem for man.
[ETHNIC PSYCHOLOGY AND THE SCIENCE OF EUGENICS.]
(Abstract.)
By Prof. Enrico Morselli,
Director of the Clinic for Mental and Nervous Diseases, Genoa University.
All natural varieties or races of mankind differ, not only by their physical, but also by their mental, characters. There exists, therefore, an "Ethnic Psychology" which, along with "Ethnic Somatology," constitutes the complete Science of Anthropology or the Natural History of Man. This must describe and classify races and populations under a double aspect—physical and psychical.