40 SYMBIOGENES1S 



plant-animals the carbohydrates manufactured in excess of 

 their own requirements by the green cells are translocated to 

 the colourless tissues and used by them as food-material. The 

 streaming of this food-material is comparable to the inter- 

 connected movements of raw material and manufactured 

 articles or capital (stored-up labour) along the highways of 

 international trade, and that similar trade relations exist 

 between plant and animal and in the organic world generally, 

 and have persisted throughout evolution, I have already partly 

 shown in my previous volume (Evolution by Co-operation}. 



If it is true that all later developments of animals and 

 plants are based on a primordial plant-animalism, we may 

 assume that with every progressive division of labour there 

 went a possibility of further mutual enhancement, and, like- 

 wise, that the normal influence of the biological environment 

 tended to favour the increase of efficiency rather than other- 

 wise. The same favourable influence must have obtained for 

 any particular qualification and character which provided 

 scope for increased mutual aid and mutual advancement. 



It is as the result of such deeply ingrained primordial 

 instincts and needs of co-operation, based as they are on 

 organic solidarity and organic self-preservation, that the 

 foundations of organic progress were too deeply laid for the 

 predaceous types to effect any lasting encroachments: " Und 

 immer zirkulirt ein neues, frisches Blut." The new and fresh 

 blood, as I have stated above, is the efficient blood resulting 

 from adequate nutritional amphimixis and receiving ever new 

 dynamic evolutionary value from the associated wholesome 

 activities. Impure blood, on the other hand, flows 

 increasingly in the channels of predaceous life and causes 

 abnormality, precocity, monstrosity, and extinction. 



Those animals which do not confine themselves in their 

 food habits to just proportions and to the proper material 

 " love-foods " at the higher stages thus become, in my view, 

 eventually debarred from progress, and drift into blind alleys 

 of evolution. 



