86 ANDREWS. 



can be traced often by movements of such inclusions. That 

 cell walls form at times no barrier to wanderings of the living 

 substance seems to be shown. It is noteworthy that these things 

 can take place without disturbance of a structure of Biitschli. 



Since these observations were made, there have been many 

 additions to our knowledge of intercellular connections in 

 higher Metazoa. They are but links in an endless chain of 

 evidences that the living substance clings pertinaciously to its 

 protoplastic habit ; and that the formation of a firm peripheral 

 pellicle about subdivisions of a whole mass is in any case no 

 proof of actual physical, or physiological, separation of the 

 substance, any more than the presence of stable structures of 

 Butschli argues a quiescent state of the living substance. 



I am aware that, because of the restrictions of the preserved 

 and sectioned condition in which most intercellular connections 

 have been discovered, these are commonly regarded as stable 

 processes from the cells. I think we have now grounds for 

 thinking of them as possible routes of travel of the unstable 

 and migrant substance, or at least as protoplastic formations. 

 For everywhere I find the living substance shifting its where- 

 abouts, combining and recombining its elements, and always, 

 after each turn of the physical kaleidoscope, there is found 

 associated with the new design a new manifestation of ordered 

 activities. 



Clearly it is a habit of the substance to be tenacious of con- 

 tinuity between portions of its mass, except when it organizes 

 its activities and itself to transplant a portion of itself to a new 

 environment.^ Those apparent contradictions of this fact 

 offered by blood corpuscles and wandering cells do not interfere 

 with this view since in the case of the latter, and indeed all 

 cases in which exist protoplastic activities, there is reestablished 

 from time to time by means of these a true connection with 

 the areas of viscid foam through which they wander ; and in 

 case of the former, a slight readjustment of our standpoint, or 

 even a slight addition to our knowledge of their true life history 

 along the lines of these studies, may bring them strictly within 

 the same assumption. 



^ Fosterhood. 



