7V/i° Structure of Colored Blood- Corpuscles. 313 



from the parent body, the latter becomes transformed into a pale 

 disk, in which no traces of a net-work, or but very indistinct 

 ones, are visible, a so-called ghost. 



At every stage of the protrusion of either flaps, or peduncu- 

 lated knobs, or granules, the living matter may be overtaken by 

 death, and the contraction become fixed by cadaveric rigidity. 

 It may perhaps be worth while to notice that irregular contrac- 

 tions have a somewhat greater tendency to such permanency 

 than regular ones; these more frequently yielding, by relaxation 

 of the net-work, or re-establishment of the state of rest, at 

 impending death. But in the blood-corpuscles kept for over 

 two years in bichromate of potash, all the described forms can 

 be observed just as well as in freshly made specimens. 



The reason why the corpuscles of the smallest size do not 

 change in the solution of bichromate of potash of medium con- 

 centration, is, perhaps, that, being compact masses of living 

 matter in which the haemoglobin is not as yet accumulated 

 within meshes, the solution does not reach and cannot extract 

 the haemoglobin. These small globules are probably interme- 

 diate stages of development of colored blood-corpuscles, or the 

 so-called hsemato-blasts of Heitzmann 1 and of Hayem.' 2 



(1) " Studien am Knorpel unrl Knochen " Med. Jahrbb., 1872. 



(2) " Sur 1'evolution des globules rouges dans le sang des vertebres ovipares." Compt. 

 rend. Acad, des Sci., Nov. 12, 1877; Idem, Sac. de Biologie, Nov. 24, 1877. " Sur 1'evolution 

 des globules rouges dans le sang des animaux superieurs." Compt. rend. Acad, des Sci., 

 Dec. 31, 1877. 



