JOURNAL OF MICROSCOPICAL SCIENCE. 
EXPLANATION OF PLATES XV & XVI, 
Illustrating Mr. Ray Lankester’s Observations and Experi- 
ments on the Red Blood-corpuscle. 
g. 
1.—Normal freshly-shed red corpuscles of the frog; a, with no nucleus 
to be seen. 
2. Various exceptional forms from absolutely fresh and healthy frog's 
blood, not subjected to any reagents; a, a, are remarkable as show- 
ing a separation of the content (zooid) from the wall (cecoid). 
3, @, a.—Frog’s red corpuscle subjected to oblique pressure ; 4, shrunk in 
10 per cent. common salt solution, in which they subsequently 
dissolve. 
4.—Ageregations of frog’s red blood-corpuscles, due to separation from the 
plasma by means of oil. 
5, a, b, c, d—Gradual action on the frog’s red corpuscle of increasing 
condensation of aqueous vapour ; ¢, stroma left after copious action 
of aqueous vapour. 
6.—Action of CO,; a, nucleus granulated by CO, in a “steamed cor- 
puscle,” such as fig. 5, c; 6, the same corpuscle when atmospheric 
air or neutral gas is passed into the gas chamber so as to replace the 
CO,; ¢, the same, when CO, is again introduced ; d, the same, after 
several alternations of CO, and atmospheric air ; e, 7, similar corpus- 
cles after repeated “ steaming” and action of CO,, with permanent 
nucleus ; g, granulations in the body occurring under the prolonged 
action of CO,, and repeated steaming. 
7, a, b, c-—Various forms of the radial cleavage of the body of the frog’s 
red corpuscle; a, tubercular form identical with the ‘ thorn-apple- 
form’ of the human blood-corpuscle. 
d, d, Contraction of the zooid, caused by boracic acid. 
8, a, b, c—Gradual action of increasing strength of acetic acid vapour. 
d, d, Granulation of the body with clear nucleus, caused by alcohol 
(frog). 
9.—Action of ammonia: a, a, first changes due to small traces of NH, 
gas; 4, 6, further change of form (frog). 
10. Action of ammonia: a, a remarkable result frequently obtained with 
slight quantities of ammonia-gas ; 4, acetic acid vapour added to a 
(frog). 
11, a, a, a.—Separation and crystallisation of hemoglobin, due to action of 
dilute ammonia gas; 4, 4, acetic acid vapour added to a, a (frog). 
12,—Diffluent ameeboid figures resulting from action of dilute ammonia gas 
on frog’s red corpuscles ; A, such a corpuscle throwing out its pro- 
cesses; a’, the same rounded, and its body granulated by the sub- 
sequent action of acetic acid vapour. 
