THE MICROSCOPE. 



demonstrated the existence of the envelope. (See Ranvier, Action 

 of Alcohol on the Corpuscle, Traiie Technique U Histologic, p. 193, 

 Paris, 1875). 



We are inclined to think that the curved position of these 

 parasites is not due to any tetanic action produced by the osmic 

 acid, as the position of No. 8 must have been assumed anterior to 

 any action of the osmic acid upon it. 



That the action of these parasites is destructive to these corpus- 

 cles is clearly shown by Figures 9 and 10. They may cling to them 

 or inhabit them for the purpose of feeding on them, as well as receiv- 

 ing oxygen, of which the corpuscles are the carriers. . 



A large proportion of the corpuscles have upon them a number 

 of white spots, about the exact nature of which we are not prepared 

 at present to express an opinion. They may be or at least resemble 

 somewhat the vacuoli described by different authors. These spots 

 are seen in the blood of other terrapins, which contains no parasites. 



Fig. 1 1 shows the blood corpuscles and parasites in the capil- 

 laries of the mensentery. 



As to the coloring of the accompanying Figures, they are as 

 accurate as it was possible to get them, and we are greatly indebted 

 to the artistic skill of Mr. Peple on that account. 



We simply record what we have seen without expressing any 

 positive opinion. In what relation this parasite stands to the 

 Dupanidium ranarum or Gaule's Wuermchen in frog's blood, as 

 described by Prof. Ray Lankester, in the Quarterly Journal Micro- 

 scopical Science, January, 1882, or to the Fillariae, of which the 

 Fillaria sanguis hominis, discovered by Wucherer, is a notable 

 example, we leave those to determine who have better facilities. 



Wm. R. Weisiger, M. D , Manchester, Va. 

 Rev. Ed. Huber, Baltimore, Md. 



r 



DESCRIPTION OF PLATE. 



Figures 1, 2, 3, 4, 5, 6, 7 and 8 taken with a x /s im. of Powell & Lealand 

 A eye piece. 



Figures 9 and 10, with Tolles' j<r im. A eye piece. 



Figure 11, is a capillary from the mesentery of the animal with contained 

 blood corpuscles. 



A. — Corpuscle with vacuolfe. 



B. — Nucleus of capillary. 



C. — -Blood corpuscle with parasite on it. 



