138 Brain: 



progress of organic development in the past, become 

 mutually dependent and inter-dependent one upon another 

 until one order cannot live without the presence and 

 function of the others. Such are the bone cells, the 

 muscle cells, the connective tissue cells, the hepatic^ 

 pulmonic, splenic, intestinal, spermatic, epithelial, capil- 

 lary and glandular cellg ; an extensive congeries of diverse 

 tissues, each containing millions of individuals and all 

 mutually dependent on the general well-being and safety 

 of the organism. 



So far as can be judged by a comparison of man to-day 

 with man in earliest historic times and man with the 

 lower ujaprogressive mammals, all these above-mentioned 

 cells, or differentiatitJHS £>f cells, are no longer progressive. 

 Even their abnormalities are unprogressive. For the good 

 reason that there is nothing in the terrestrial environment 

 which now calls for a re-adaptation ; nor has there been 

 for thousands of years. The type of cell has assumed 

 permanence. 



There is, however, a tissue of the organism, an order, 

 or differentiation of cells, which we have not yet men- 

 tioned, namely, the nerve and brain order. In brain and 

 nerve we contemplate a colony or order of cells, incorpo- 

 rated within the organism, living at the expense of the 

 other orders, devoted to the acquisition of knowledge : a 

 function diverse from all others, nobler than all others. In 

 a sense, it is as if this brain order were a superior parasite 



