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Table of contents
PREFACE
INTRODUCTION
REPRODUCTION-1
REPRODUCTION-2
REPRODUCTION-3
ANATOMY OF THE REPRODUCTIVE ORGANS-1
ANATOMY OF THE REPRODUCTIVE ORGANS-2
ANATOMY OF THE REPRODUCTIVE ORGANS-3
ANATOMY OF THE REPRODUCTIVE ORGANS-4
THE SEXUAL RELATIONS-1
THE SEXUAL RELATIONS-2
THE SEXUAL RELATIONS-3
THE SEXUAL RELATIONS-4
THE SEXUAL RELATIONS-15
CHASTITY-1
CHASTITY-2
CHASTITY-3
CONTINENCE
MARITAL EXCESSES-1
MARITAL EXCESSES-2
MARITAL EXCESSES-3
PREVENTION OF CONCEPTION:ITS EVILS AND DANGERS-1
PREVENTION OF CONCEPTION:ITS EVILS AND DANGERS-2
INFANTICIDE AND ABORTION
THE SOCIAL EVIL-1
THE SOCIAL EVIL-2
THE SOCIAL EVIL-3
SOLITARY VICE-1
SOLITARY VICE-2
RESULTS OF SECRET VICE-1
RESULTS OF SECRET VICE-2
EFFECTS IN FEMALES
CURATIVE TREATMENT OF THE EFFECTS OF SELF-ABUSE-1
CURATIVE TREATMENT OF THE EFFECTS OF SELF-ABUSE-2
CURATIVE TREATMENT OF THE EFFECTS OF SELF-ABUSE-3
A CHAPTER FOR BOYS-1
A CHAPTER FOR BOYS-2
A CHAPTER FOR BOYS-3
A CHAPTER FOR BOYS-4
A CHAPTER FOR GIRLS-1
A CHAPTER FOR GIRLS-2
A CHAPTER FOR GIRLS-3
INDEX

body with two heads. If a partial division occurs at each end, the 

resulting being will possess two heads and two pairs of legs joined 

to a single body. More complete division produces a single trunk with 

two heads, two pairs of arms, and two pairs of legs, as in the case 

of the Carolina twins. Still more complete division may result in the 

formation of two perfect individuals almost entirely independent of 

each other, physiologically, but united by a narrow band, as in the 

remarkable Siamese twins, Chang and Eng. 

 

In a curious case reported not a great while ago, a partially developed 

infant was amputated from the cheek of a child some time after birth. 

 

The precise cause of these strange modifications of development is as 

yet, in great degree, a mystery. 

 

Hybrids.--It is a well-known law of biology that no progeny result from 

union of animals of different species. Different varieties of the same 

species may in some cases form a fertile union, the result of which 

is a cross between its two parents, possessing some of the qualities 

of each. The mule is the product of such a union between the horse and 

the ass. A curious fact is that the offspring of such unions are 

themselves sterile almost without exception. The reason of this is that 

they do not produce mature elements of generation. In the mule, the 

zoosperms are either entirely absent or else very imperfectly 

developed; hence the fact that a colt having a mule for its sire is 

one of the rarest of curiosities, though a few instances have been 

reported. This is a wise law of nature to preserve the purity of species. 

 

Law of Sex.--If there is a law by which the sex of the developing embryon 

is determined, it probably has not yet been discovered. The influence 

of the will, the predominant vitality of one or the other of the parents, 

and the period at which conception occurs, have all been supposed to 

be the determining cause. A German physician some time since advanced 

the theory that the two testicles and ovaries produce elements of 

different sexual character, the right testicle forming zoosperms 

capable of producing only males, and the right ovary producing ova with 

the same peculiarity. The left testis and the left ovary he supposed 

to form the female elements. He claimed to have proved his theory by 

experiments upon animals. Even if true, this theory will not be made 

of practical importance. It is, in fact, nothing more than a revival 

of an old theory held by physicians who flourished more than two 

thousand years ago. 

 

More recently another German physician has advanced the theory that 

the sex may be controlled at will by observing the time of fecundation. 

He asserts that when fecundation occurs shortly after menstruation, 

the result will be a female; but if impregnation occurs later in the 

month, and prior to the three or four days preceding the next menstrual 

period, a male will almost certainly be produced. This theory was 

proposed by Prof. Thury of the academy of Geneva, who claims to have 


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