86 WHAT IS LIFE? 



Well, then, we see by what means atoms and 

 molecules enter the body. In the human female there 

 are two well-marked objects, each called an u ovary," 

 and here by the same selective capacity are arrested the 

 atoms, now formed into complex molecules, which 

 form the eggs from which the human being is deve- 

 loped. The ovary is a sack of eggs. As the roe is to 

 fish, so is this sack of eggs to the human being. 



Fig. 9. The organs of generation of the human female (on the right the 

 membrane which remains on the left side has been out away), showing 

 in the upper part one of the Fallopian tubes and below one of the sacs 

 of eggs the ovary. In the centre is the womb. (From Quain and 

 Wilson's Anatomical Plates, reduced.) 



The egg is very minute at first. It absorbs by its 

 inherent power food, i.e. molecules, from the blood and 

 thereby grows. A time comes when it is large enough 

 to be seen by the microscope. Imbedded in the body of 



absorption is effected." (" An Introduction to Human Physiology." 

 A. D. Waller, M.D., F.B.S., 1896, p. 162.) " Living tissues are con- 

 stantly in a state of chemical change, consuming and assimilating to 

 themselves materials which they derive from the blood, and rejecting 

 the consequent waste products. These are discharged into and 

 carried away by the blood, which contains, therefore, the materials 

 in the used-up form, viz. carbonic acid and urea. (Jdem, p. 10.) 



