300 The Structure of Colored Blood- Corpuscles. 



to determine more certainly than has yet heen done liow far 

 amoeboid movements and contractions do take place in the 

 much-examined and much- written about red blood-corpnscles. " 



Lieberlcilhn observed in the red corpuscles of salamahdra and 

 pike's blood active ■protrusion and retraction of bead-like pro- 

 cesses. He also saw movements of grannies or small molecules 

 in the interior of the red blood-corpuscles of living frog embryos. l 



Faber, 2 in addition to his own observations of contractility 

 and spontaneous locomotion of colored blood-corpuscles in albu- 

 minous urine — phenomena which continued to be manifested for 

 a longer time in colored than in colorless corpuscles — has given 

 a rather complete account of the literature of these phenomena,, 

 including the reports of diapedesis observed by Virchow, 

 Strieker, Cohnheim, Prussak and Hering. The observations of 

 amoeboid movements by Bastian (just cited), Owsjannikow,* 

 Winkler 4, and Brandt* seem to have escaped him; Arnold's 

 experiments concerning diapedesis/ and Belfield's observation 

 of emigration of certain small-sized red corpuscles of the frog, 7 

 were published more recently. Since the publication of Faber's 

 article, furthermore, Rommelaere has described amoeboid move- 

 ments of colored blood-corpuscles ; 8 Brandt 9 has spoken of the 

 peculiar forms of the red blood-corpuscles" of Sipunculus and 

 Phascolosoma referable to amoeboid movements, and of the fact 

 that occasionally in the temperature of an ordinarily warmed room 

 considerable movements are accomplished ; and Schmidt has ob- 

 served spontaneous motion (expansion and contraction) in a 

 fresh colored blood-corpuscle of Amphiuma in one instance, 10 and 



(!) "Ueber Bewegungserscheinungen der Zellen." Schriften der Gesellscliaft zur Beforde- 

 rung der gesammten Naturwissenscbaften zu Marburg, vol. IX (1870), p. 335. 



(2) " Ueber die rothen Blutkcirperchen." Archiv der Heilkunde, XIV (1873), pp. 481 -511. 



(3) Op. (At., p. 563. 



(4) Textur, Structur und Zellleben in den Adnexen des Menschlichen Eies. Jena, 1870, p. 33. 



(5) " Anatomisch-hist. Untersuchungen iiber d. Sipunculus nudus, L." Memoires de 

 l'Academie Imperiale des Sciences de St. Petersbourg, VII. Serie, t. XVI, No. 8. 



(6) Loc. cit. 



(7) " Emigration in passive hyperasmia." American Quarterly Microscopical Journal, Oc- 

 tober, 1878, p. 39. 



(8) De la deformation des globules rouges du sang. Bruxelles, 1874, p. 47. 



(9) In a foot-note to his " Bemerkungen iiber die Kerne der rothen Blutkorperchen," I. ft, 

 pp. 391, 392. 



(10) Op. Cit., p. 67. 



