JOURNAL 
OF THE 
ROYAL MICROSCOPICAL SOCIETY. 
JULY, 1878. 
I. — The Structure of the Coloured Blood-corpuscles of Amphiuma 
tridactijlum, the Frog, and Man. By Dr. H. D. Schmidt, 
Pathologist of the Charity Hospital, New Orleans, La. 
{Taken as read before the Royal Microscopical Society, April 3, 1878.) 
Plate V. 
{Continued fromp. 78.) 
Before further discussing in detail the observations relating to 
the structure of the coloured blood-corpuscles of the Amphiuma, I 
propose to give a brief description of the mode of their development 
from the colourless corpuscles. Their origin, or original develop- 
ment in the first stages of embryonic life, I had no opportunity to 
observe ; for in those embryos which I fortunately obtained they 
were already completely formed. 
As we may suppose that the metamorphosis of a colourless 
blood-corpuscle into a coloured one is not accomplished in a space 
EXPLANATION OF PLATE V. 
Fig. 28. — Coloured blood-corpuscle of Amphiuma, treated with a 2 per cent, 
solution of boracic acid. 
Fig. 29. — Coloured blood-corpuscle of Amphiuma, treated with the vapour of 
a 4 per cent, solution of osmic acid. 
Figs. 30, 31, 32, and 33. — Coloured blood-corpuscles of Amphiuma, treated 
with a strong solution of hydrate of chloral. 
Fig. 34. — Coloured blood-corpuscle of Amphiuma, treated with nitric acid 
vapour. 
Fig. 35. — Coloured blood-corpuscle of Amphiuma, treated with nitric acid 
liquid. 
Figs. 36 and 37. — Coloured blood-corpuscles of Amphiuma, treated with 
diluted nitric acid. 
Fig. 38. — Coloured blood-corpuscle of Amphiuma, treated with ether liquid. 
Fig. 39. — Colourless blood-corpuscles of adult Amphiuma. 
Fig. 40. — Different forms of transition from the colourless into the coloured 
blood-corpuscles, met with in the blood of adult Amphiuma. 
Fig. 41. — Colourless blood-corpuscles from the pulp of the spleen of adult 
Amphiuma. 
Fig. 42. — Colourless blood-corpuscles and their transitory forms into the 
coloured corpuscles, met with in the blood of the very young Amphiuma. 
[Fig. 43. 
I 
YOL. I. 
