1 6 ANDREWS. 



The structure and growth of starch grains, and possibly 

 the behavior of their different layers in swelling ; the froth-like 

 structure which no treatment seems to take from them ; the 

 redistribution at times of their substance through the proto- 

 plasm; the formation and dissolution of yolk, which in some 

 cases at least, is a physical process before it seemingly becomes 

 a chemical process ; the numerous redistributions seen to take 

 place in the nuclear element we call chromatin : — all these 

 become intelligible if interpreted as phenomena of the finer 

 froth; differing in point of minuteness only from characteristic 

 phenomena seen in Butschli's structure. 



Such an interpretation is not only plausible but is forced 

 upon us in many cases by the optical phenomena attending the 

 physical fact. It is indeed hardly to be escaped, for down to 

 the limits of vision there is found in all parts of living masses 

 a certain absolute unity of structure and of phenomena.^ 



[12] Similar evidences that the network " grarmles " are of the 

 nature of compound inclusions, are to be had in their disappear- 

 ance during structural reductions, or subdivisions of Butschli's 

 structure, which produce an appearance of homogeneous proto- 

 plasm ; and in their reappearance upon return of the structure 

 to the first coarser organization which produced a distinct 

 network. 



[13] The universal presence of the "granules," or of the ele- 

 ment which is so named, as seen in Butschli's network, suggests 

 that we have here an element, which is in some way essential to 

 some if not all of the characteristic activities of the substance ; 

 that in the form in which it is best known it stands not merely 

 for a passive chemical inclusion, but for a physiological area or 

 substance organ. ^ 



Certain strong resemblances of the granules to the chromatin 

 of nuclear threads may be not wholly superficial, but hold the clue 

 to a right interpretation of these most interesting substances.^ 



How long the lamellar substance of compound inclusions 

 persists in a living state, and what, during that time, may be 



^ See Areal Differentiation ; also Activities — filose. 



2 Idem ; also Habit. 



* For movements of the granules, see Activities — filose. 



