314 



THE STRUCTURE AXD OTHER CHARACTERISTICS 

 OF COLORED BLOOD-CORPUSCLES. 



o 



SYNOPSIS. 



Human colored blood-corpuscles vary so much in size, that it is not pos- 

 sible to distinguish them by their size from certain other mammalian 

 colored blood-corpuscles : — Observations, p. 265. Literature, p. 275. 



Colored blood-corpuscles are portions of the living matter of the body, pos- 

 sessing contractility : — Observations, p. 267. Literature, p. 297. 



They assume various shapes:— Observations, p. 266. Literature, p. 282. 

 Explanation, p. 312. 



They are vacuolized : — Observations, p. 269. 



They have no separate investing membrane ; nevertheless the outer portion 

 may be considered differentiated, especially at the periphery of the 

 disk, where it constitutes an encircling band, occasionally of a 

 wreath-of -beads appearance : — Observations, p. 270. Literature, p. 286. 



As a rule, human colored blood-corpuscles have no nucleus ; but, occasion- 

 ally, there is an accumulation of matter in the interior which may be 

 interpreted as such: — Observation, p. 271. Literature, p. 294. 



The structure of colored blood-corpuscles is like that of other living matter 

 (bioplasson), viz. : it constitutes a net-work such as was first described 

 as the structure of protoplasm by Heitzmann. In the Pyrensemata, 

 the intranuclear net-work is in connection with the extranuclear : — 

 Observations, p. 269 et seq. Literature, p. 302. 



Examination of specimens with various solutions of bichromate of pot- 

 ash:— p. 272. 



Examination of colored blood-corpuscles of ox and of newt: — p. 274. 

 Conclusions, p. .308. 



EXPLANATION OF ILLUSTRATIONS. 



[Figs. 1 to 6 are included in Plate XII.] 



Fig. 1, exhibits shape-changes of colored blood-corpuscles by indentation. 



a, progressing and retrogressing furrowing. 



b, indentations leading to irregular forms. 



r, indentations leading to more or less regular forms. 



cl, instances of extreme and exceptional forms, especially the sharp- 

 pointed stellated figure. 



e, four phases of form-change, observed in one corpuscle, with 

 separation of a constricted portion. 

 Fig. 2, shows knob-formation, principally by protrusion. 



a, Nos. 1 and 2, progressive and retrogressive protrusion; No. 3, 

 one pedunculated and three sessile knobs ; No. 4, detachment 

 of two knobs. 



