. The science of eugenics and sex life, the regeneration of the human race ... PROGRESS OF PREGNANCY. 359 standing, though it is sometimes not observed until the urine has stoodeight days. The experiments of Dr. Rane and others prove that theReisteine is not peculiar to pregnancy alone, but that it has specialrelation to lactation, either prospective or actually present; since itmakes its appearance either where the milk is imperfectly withdrawnfrom the breasts, or in thosecases in which, as in preg-nancy, nature is preparingfor the further function oflactation. THE FOETAL HEART-BEAT, ETC. Sen
. The science of eugenics and sex life, the regeneration of the human race ... PROGRESS OF PREGNANCY. 359 standing, though it is sometimes not observed until the urine has stoodeight days. The experiments of Dr. Rane and others prove that theReisteine is not peculiar to pregnancy alone, but that it has specialrelation to lactation, either prospective or actually present; since itmakes its appearance either where the milk is imperfectly withdrawnfrom the breasts, or in thosecases in which, as in preg-nancy, nature is preparingfor the further function oflactation. THE FOETAL HEART-BEAT, ETC. Sensible signs of preg-nancy are observed throughthe medium of touch andhearing. By the touch weexamine the condition andposition of the uterus and itsrelations to the adjacentparts, externally through thevagina, and if necessarythrough the rectum. Byauscultation we ascertain theprobable existence of preg-nancy from hearing at a little later period, the pulsations of the foetalheart. The term touch signifies the means whereby knowledge isObtained of the condition of the THE PLACENTA. Foetal face, next the embryo. This surface has aglistening appearance, with numerous dark ridgesor vessels, the largest being veins, and the color of*the blood shining through. HOW THE EMBEYO IS NOURISHED. While passing through the Fallopian tube the ovum increases insize from one one hundred and twenty-fifth of an inch to one-fiftiethor one twenty-fifth of an inch by a process of yolk nutrition. As soonas the spermatozoa penetrate the outer membrane of the egg, theyolk contracts, leaving a space filled with a transparent fluid. In 360 SIGNS AND PROGRESS OF PREGNANCY. contracting, the yolk begins a rotary movement and gradually breaksup into fine granular masses, which about six days after conceptionbecome united again by their adjacent edges, forming a continuousdeposit of albumen called the chorion. This, on its outer surface, hasa number of hollow, hair-like tubes called villi, projecting i
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