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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1850 edition. Excerpt: ...this rule may not hold good in many single fami ies that may be noticed, but it will always do so when the average is taken of a large number, and the chances are of course in the same ratio in every instance. Thus in every case when the father is over eighteen years older than the mother it is two chances to one that the child will be a boy, and in three hundred such births there would be just two hundred male to one hundred females; while if the mother be so much the elder the chances and results will be just the same the other way. The relative age, therefore, has a most potent influence over the sexual formation, but still there are evidently other agencies also, because it does not operate in every individual case, and we must therefore endeavor to discover what those other agencies are. My own impression is that in the exceptional cases, where the elder parent does not impart the sex, it is owing to the younger parent being much the more vigorous. This view I have ad many opportunities of verifying, in confidential communications, and I have almost invariably found it correct. This also shows why it is that the greater age is no advantage beyond a certain period. Thus for instance if the father be overfifty, while the mother is under thirty-five, the rule will change, and the number of girls will predominate. We also find that the greater number of first children are boys, especially if born soon after marriage, owing to the father being naturally most powerful then. In illegitimate children on the contrary there are most girls. probably because in many of these cases the female is more vigorous than ordinary.--In those countries where polygamy predominates, or where, the men have several wives, there are many more girls born than...
Reprint of the original, first published in 1872. The publishing house Anatiposi publishes historical books as reprints. Due to their age, these books may have missing pages or inferior quality. Our aim is to preserve these books and make them available to the public so that they do not get lost.
This is a catalogue of the Edward C. Atwater Collection of rare books dealing with "popular medicine" in early America which is housed at the University of Rochester Medical School library. The books described in the catalogue were written by physicians and other professionals to provide information for the non-medical audience. The books taught human anatomy, hygiene, temperance and diet, how to maintain health, and how to cope with illness especially when no professional help was available. The books promoted a healthy lifestyle for the readers, giving guidance on everything from physical fitness and recreation to the special health needs of women. The collection consists of works dealing with reproduction [from birth control to delivering and caring for a baby], venereal disease, home-nursing, epidemics, and the need for public sex education. These books, covering areas largely ignored by the medical profession, made important contributions to the health of the American public, and the collection is a vital piece of medical history. The collector is Edward C. Atwater, Professor Emeritus of Medicine and the History of Medicine at the University of Rochester Medical School. Christopher Hoolihan is History of Medicine Librarian at the University of Rochester Medical School's Edward G. Miner LIbrary.