Many instances could be quoted, some in which extreme cases of polydipsia and bulimia developed; these can be readily attributed to the increased call for liquids and food. Other cases of diverse new emotions can be recalled, such as lasciviousness, dirty habits, perverted thoughts, and, on the other hand, extreme piety, chastity, and purity of the mind. Some of the best-natured women are when pregnant extremely cross and irritable and many perversions of disposition are commonly noticed in pregnancy.
There is often a longing for a particular kind of food or dish for which no noticeable desire had been displayed before.
Maternal Impressions.--Another curious fact associated with pregnancy is the apparent influence of the emotions of the mother on the child in utero. Every one knows of the popular explanation of many birth-marks, their supposed resemblance to some animal or object seen by the mother during pregnancy, etc. The truth of maternal impressions, however, seems to be more firmly established by facts of a substantial nature. There is a natural desire to explain any abnormality or anomaly of the child as due to some incident during the period of the mother's pregnancy, and the truth is often distorted and the imagination heavily drawn upon to furnish the satisfactory explanation. It is the customary speech of the dime-museum lecturer to attribute the existence of some "freak" to an episode in the mother's pregnancy. The poor "Elephant-man" firmly believed his peculiarity was due to the fact that his mother while carrying him in utero was knocked down at the circus by an elephant. In some countries the exhibition of monstrosities is forbidden because of the supposed danger of maternal impression. The celebrated "Siamese Twins" for this reason were forbidden to exhibit themselves for quite a period in France.
We shall cite only a few of the most interesting cases from medical literature. Hippocrates saved the honor of a princess, accused of *****ery with a negro because she bore a black child, by citing it as a case of maternal impression, the husband of the princess having placed in her room a painting of a negro, to the view of which she was subjected during the whole of her pregnancy. Then, again, in the treatise "De Superfoetatione"there occurs the following distinct statement: "If a pregnant woman has a longing to eat earth or coals, and eats of them, the infant which is born carries on its head the mark of these things." This statement, however, occurs in a work which is not mentioned by any of the ancient authorities, and is rejected by practically all the modern ones; according to Ballantyne, there is, therefore, no absolute proof that Hippocrates was a believer in one of the most popular and long-persisting beliefs concerning fetal deformities.
In the explanation of heredity, Hippocrates states "that the body of the male as well as that of the female furnishes the semen.
That which is weak (unhealthy) is derived from weak (unhealthy)parts, that which is strong (healthy) from strong (healthy)parts, and the fetus will correspond to the quality of the semen.