350 BIOLOGICAL PHYSICS 



lines in definite direction, at length becomes the sarcous or 

 true muscle substance of the invaded muscle plates, and 

 thereafter become arranged in relation to the future 

 skeleton according to the specific requirements of every 

 part of the organism in regard to movement and the 

 other functions of a muscular system. 



In this developmental process we see the same 

 evolutionary principles and factors at work as we see in 

 the formation of the alimentary canal, and its related 

 digestive and circulative agencies for purposes of the 

 preparation of the raw materials of the food for the 

 purposes of future nutrition, and in the elaboration of a 

 blood circulatory machinery which will carry these 

 elements of nutrition to every structure of the body, and, 

 with its related lymphatic vasculature, perform the 

 functions of a great drainage system, all which formative 

 phenomena in their organic results but prove the 

 universality of the principle of circulation as the actuating 

 and guiding agency in the vital work and physiological 

 activities of the human, and all animated bodies, and that 

 there are no insuperable obstacles or impervious barriers 

 to the regulated onward passage of nutritive as well as 

 effete material, either in mass or in molecule, a truth 

 expressible by the paraphrase : circulatio circulationum y 

 omnia circulatio. 



