LIFE, ITS PHYSICAL BASIS AND SIMPLEST EXPRESSION 29 



ilar significance are applied to the viscous hyaline ground 

 substance, while the denser parts are variously called micro- 

 somes, granules, fibrils, spongioplasm, etc. 



The important part of all this is the fact that all the biologists 

 are not agreed on any certain kind of intimate structure of 



FIG. 15. Different types of cells composing the body of the squirrel or other highly 

 developed animal : A, liver cell; /, food materials; n, nucleus; B, complete cell; 

 C, nerve cell, with small part of its fiber; D, muscle fiber; E, cells lining the body 

 cavity; F, lining of the windpipe; G, section through the skin. (Highly magnified.) 



protoplasm as revealed by the highest powers of the microscope, 

 but they all agree that there is a fine and real structural organ- 

 ization of what at first glance appears to be homogeneous 

 structureless life stuff. That is, as Delage expresses it, it is seen 

 that protoplasm is not simply an organic chemical compound, 

 but that it is an organized substance; that is, it possesses a 

 structure of a higher order than the automatic structure of those 

 chemical molecules which compose non-living so-called organic 

 substances. But at the same time we are deceived if we expect 



