7H GENERATION AND DEVELOPMENT. 



through, the body ; fright causes sensations to be felt in 

 many parts of the body ; and even the thought of tickling 

 excites that sensation in individuals very susceptible of it, 

 when they are threatened with it by the movements of 

 another person. These sensations from internal causes are 

 most frequent in persons of excitable nervous systems, 

 such as the hypochondriacal and the hysterical, of whom 

 it is usual to say that their pains are imaginary. If by 

 this is meant that their pains exist in their imagination 

 merely, it is certainly quite incorrect. Pain is never 

 imaginary in this sense ; but is as truly pain when arising 

 from internal as from external causes; the idea of pain 

 only can be unattended with sensation, but of the mere 

 idea no one will complain. Still, it is quite certain that 

 the imagination can render pain that already exists more 

 intense and can excite it when there is a disposition to it. 



CHAPTER XX. 



GENERATION- AND DEVELOPMENT. 



THE several organs and functions of the human body 

 which have been considered in the previous chapters, have 

 relation to the individual being. We have now to con- 

 sider those organs and functions which are destined for 

 the propagation of the species. These comprise the several 

 provisions made for the formation, impregnation, and 

 development of the ovum, from which the embryo or 

 foetus is produced and gradually perfected into a fully- 

 formed human being. 



The organs concerned in effecting these objects are 

 named the generative organs, or sexual apparatus, since 

 part belong to the male and part to the female sex. 



