78 The Non- Inheritance of Sex in Man 
There are moreover many other considerations which lead to the belief that sex 
is not influenced after impi'eguation, but is already determined at that time or 
before (conf Lenhossek (1) and Morgan (3) ). Many writers who favour this 
theory nevertheless believe that parental organisms have considerable influence on 
the proportion of males to females, although this influence is exerted prior to 
impregnation. This question is discussed in its many relations in Orschansky 
(5). His statistics are, however, far from convincing. On page 122 we find the 
following: "Die Beobachtungen an kranken Familien ergeben die augenscheinlich 
paradoxe Thatsache, dass ein Erzeuger mit der schwachsten Konstitution eine 
grossere Neigung als ein gesunder iiussert, sein Geschlecht auf seine Kinder zu 
iibertragen." 
If it be true that sex is dependent on any constitutional or nutritional influence 
exerted during the formation or ripening of the ova or spermatozoa, then like other 
constitutional differences it should be inhedted. My own figures tend to show 
that neither the soma of the father nor the soma of the mother have any influence, 
at least in man, in the determination of sex, nor is the proportionate distribution 
of sex in any degree subject to hereditary influence. 
BIBLIOGRAPHY. 
1. VON Lenhossek, M. Das Problem der geschlechtsbestimmendeii Ursachen. pp. 99. Jena, 
1903. 
2. LoRENz, 0. Lehrbuch der gesammten wissenschaftlichen Genealogie. pp. 489. Berlin, 
1898. « 
3. Morgan, T. H. Recent Theories in Regard to the Determination of Sex. Popular Science 
Monthly, Vol. LXiv. No. 2, Dec. 1903, pp. 97—116. 
4. Newcomb, Simon. A Statistical Inquiry into the Probability of Causes of the Production of 
Sex in Human Offspring, pp. 34. Carnegie Institution of Washington, Publication 
No. 11. Washington, U.S.A., June, 1904. 
■ 5. Orschansky, 0. Die Vererbung im gesunden iind krankhaften Zustande unddieEntstehuug 
des Geschlechts beim Menschen. pp. 347. Stuttgart, 1903. 
