90 EX VIRIBUS VIVIMUS. 



not prevent the sperm-cell and germ-cell of two races 

 being so developed as to unite in forming a fertile 

 ovum. 



Men exist in the most diverse conditions, not 

 only in distant lands and varied climates, but even 

 in the same city, in conditions so diverse, that were 

 any other organism known, to be submitted to an 

 equally great range of external agencies, even the 

 most highly developed, it must either perish, or, if 

 gradually introduced to the change, must so com- 

 pletely modify its structure as to become a new and 

 distinct species. Man may be said to make his own 

 conditions by his brain, or through it all conditions 

 may be said to be comparatively uniform for him 

 and for the animals which he chooses to associate 

 with himself Originating probably in the East, in a' 

 warm but not a tropical climate, feeding on rich and 

 abundant fruits, he has yet gradually spread over 

 the whole world, and does not shew any material 

 modification of structure — no modification so great 

 as to prevent interbreeding. When circumstances 

 forced him to cold countries, his intelligence made 

 him light a fire and build a house, and cover himself 

 with the skins of other and inferior animals, which 

 he entrapped by cunning, and whose roasted flesh 

 served him as a substitute for the failing fruits. As 

 necessities arose, he learned to build boats, skill of 

 all kinds became his through his brain, and his vast 

 knowledge was gradually acquired, and handed down 



