284 The Structure of Colored Blood- Corpuscles. 



cies. Text-books and monographs give sufficient information 

 on this point, especially the article on the blood by Alexander 

 -Rollett, in Strieker's " Ilandouch der Lehre von den Geweben 

 dies Menschen und der Thiere," which has been translated by 

 Henry Power and published by the London JNew Sydenham 

 Society, and which has been republished in this country. 2 - 



Since that article was written the following observations 

 have been made : 



Zanghans, 3 in experiments on rabbits, saw, in extravasated 

 blood, red corpuscles with numerous fine projections, and, in 

 pigeons' red blood-corpuscles, also, observed morphological 

 changes. 



LieberTzuhn* described remarkable form-changes in the red 

 corpuscles of the blood of salamanders and of pikes. 



Wedl 5 observed changes of shape in human and frog's red 

 blood-corpuscles on adding a drop of concentrated aqueous 

 solution of pyrogallic acid to a drop of fresh blood. 



Hay Lankester 6 found in his own healthy Hood, in addition 

 to the ordinary biconcave forms, "thorn-apple" and "single and 

 double watch-glass" forms. In the two latter there is, when 

 the corpuscle is seen on edge, instead of a concavity, a convex- 

 ity on either one or both sides. He also described and figured 

 varieties of shape in both human and frog's colored blood-cor- 

 puscles subjected to the action of various reagents. Of these 

 I shall cite, later on, the effects of very dilute ammonia gas 

 and acetic acid vapor. 



(1) Ibid , p. 313, etc. 



(2) A Manual of Histology. By Prof. S. Strieker. American Translation edited by Albert 

 H. Buck . New York : Wm. Wood & Co., 1873. 



(3) " Beobacbtungen uber Resorption der txtravasate und Pigmentbildung in denselben." 

 Virchow's Arcbiv, Vol. 49 (1870), p. C6-116. 



(4) ' Ueber BewegungserscbeinU' gen der Zellen." Schriften der Gesellscbaft zur Beforder. 

 ung der gesammten Naturwissenscliaften zu Marburg Vol. IX (1870) p. 335 



(5) " Histologiscbe Mittheilungen : Ueber die Einwirkung der Pyrogsllussaure auf die 

 rotben Blutkorpercben." Sitzuugsbericbte der Wiener Akademie der Wissenschaften, Vol. 

 64 (1871), I Div.. p. 405 



(6) "Observations and Experiments on tbe Red Blood-corpuscle, cbiefly witb regard to 

 tb3 Actioa of (Jasaa and Vapours." Quarterly Journal of Microscopical Science, October , 

 1871, p. 361-387. 



