PLATES XV & XVI (continued). 
13, a.—Frog’s red corpuscle acted on first by dilute ammonia gas, then by 
acetic acid vapour; the nucleus is swollen and clear, the body 
granulated; 4, a similarly treated corpuscle, the nucleus is granu- 
lated; c, nucleus of corpuscle greatly swollen by action of dilute 
ammonia gas ; @, corpuscle acted on first by acetic acid vapour, then, 
e, by ammonia gas (frog). 
14, a, a.—Frog’s red corpuscle in course of destruction in a solution of 
ammonia: the nucleus is broken up; 4, the stroma left after the 
process is complete ; c, corpuscle acted on first by very dilute solution 
of ammonia, then by acetic acid; the body is granulated, the nucleus 
clear and colourless. In the right hand corpuscle, however, the 
nucleus is coloured and the body colourless, as sometimes occurs 
under the influence of this agent. 
15.—Action of chloroform: a, first stage, wrinkling of the surface or 
membrane ; 8, 4, angular forms, due to second stage of chloroform 
or of carbon bisulphide (frog). 
16, a.—Second stage of the action of chloroform; 0, 4, third stage; c, 
fourth stage (this figure is too dark, it should be very pale and 
ghost-like); @, the nucleus of ¢ granulated by acetic acid vapour 
(frog). 
17.—Further action of chloroform (liquid): a, liquid chloroform added to a 
fresh corpuscle; 4, action of liquid chloroform on the ghost-like 
stromata, fig. 16 ¢; c, d, e, f, further action of repeated additions of 
liquid chloroform, ending in the solution of the nucleus (frog). 
18, a.—Ordinary form, flat view; 4, ordinary form, edge view; c, double 
watch-glass shaped; d, single watch-glass shaped; e, thorn-apple 
shaped, human red blood-corpuscle; f, oblique pressure. 
19.—Action of aqueous vapour, followed by CO,; a, normal disc; a’, 
aqueous vapour allowed to act; 5, CO, allowed to act; c, CO, 
removed by influx of atmospheric air; d, CO, again introduced 
(human). 
20.—Action of very dilute ammonia gas on human red blood-corpuscles. 
21, a.—A rouleaux of human red corpuscles passed from the plasma into oil ; 
b, c, human red corpuscles, acted on first by very dilute ammonia gas 
and then by acetic acid vapour. 
22.—Human red corpuscles acted on, a, by solution of acetate of rosanilin ; 
&, by solution of tannin. 
23.—Frog’s red corpuscle; a, 4, c, d, gradual action of solution of acetate 
of rosanilin on the same corpuscle; e, various corpuscles, one with 
four Robertsian macule, another with escaped nucleus, but retaining 
its macule; 7 having first been acted on by dilute NH, gas; g, 
having been first allowed to dry. 
24.—Frog’s red corpuscle ; action of tannin. 
a 
