io HOW PROTOPLASM IS MADE. 



of protoplasm, is carried by the blood- 

 vessels to the innermost recesses of the body, 

 and there brought into contact with the 

 living cells of the organs and tissues : these 

 appropriate it as pabulum, and raise it to 

 the same degree of development as them- 

 selves, that is to protoplasm, make it into 

 protoplasm, into living matter ; not by 

 communicating to it any living principle, 

 any " principle of life," but by putting the 

 finishing touches to its development ; that 

 is, to the number or arrangement of its 

 molecules and to its peculiar activities 

 starting the balance-wheel of the chrono- 

 meter, so to say. 



The foregoing is the usual way in which 

 protoplasm is now made, and by most 

 biologists it is considered to be the only way ; 

 that is, that protoplasm, whether of animals 

 or plants, is made only by existing proto- 

 plasm, as a continuation of itself, as its 

 hereditary successor. 



It is by the living cells of the organs and 

 tissues that the blood is elaborated into 

 protoplasm ; the molecules of the blood 

 plasm are drawn into the interior, towards 

 the centre of the cell, and there and thence 

 developed outwards through the granules 

 and nucleus to the body-substance of the 



