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Pig. 62 (continued)—<br />
B. Gonooocci in gonorrhceal pus—white blood-corpuscles invaded.<br />
0. Pneumococci with capsules arranged in chains as seen in pneumonic sputum.<br />
THE MYCETOZOA 307<br />
D. Oapsulated pneumococci in blood taken from the heart of a rabbit inoculated with pneumonic sputum.<br />
E. Tubercle bacilli (culture on glycerine agar).<br />
F. Tubercle bacilli from phthisical sputum.<br />
G. Spherical amcBba from the wall of a liver abscess, showing nucleus and vacuolated protoplasm.<br />
H. Actinomycosis from human liver, displaying a branched felted mass of parasite surrounded by pus.<br />
1. Anthrax bacilH (culture on agar). Contains spores—the darkly-coloured bodies.<br />
J. Typhoid bacilli (culture on agar). Shows filamentous forms.<br />
K. Typhoid bacilli, showing flagella.<br />
L. Diphtheria bacilli (agar culture).<br />
M. Tetanus bacilli, some of which possess spores.<br />
N. Spirilla with red and white blood-corpuscles in relapsing fever (human).<br />
O. Glanders bacilli culture. Shows segmentation of protoplasm.<br />
PLATE LXXrX<br />
Plate Ixxix. shows rudimentary plant and animal forms'. Illustrates spherical, concentric, radiating, branch-<br />
ing, spiral, and segmented arrangements.<br />
Fig. l.—Sanina ventriculi. Low form of plant found in the human stomach—magnified (a) 1000, and (/;) 250 diameters<br />
(Goodsir).<br />
Fig. %.—Palmella cruenta. a, Patch of jelly with single cells, and dividing and divided pairs, x 400 ; b, similar cells without<br />
the gelatmous layer, the smaller granules similar to those seen in the jelly of a, x 800 ; c, cells treated with sulphuric acid and<br />
iodine, showing the cellulose coat and granular contents, x 800 (after Griffith and Henfrey).<br />
Fig. Z.—CMorococcum vulgare. a, Group in natural condition, x 800 ; h, an isolated cell, showing granular contents, x 1500<br />
c, dividing cells treated with sulphuric acid and iodine, x 1500 (after Griffith and Henfrey).<br />
Fig. 4.—A, B, C, Mucor niucedo—stages in the formation of a zygospore ; D, a sporangium containing spores ; B, Oidium ladis ;<br />
F, Aspergillus rjlaucus—myceliam (1), gonidiophore (2), and H bearing spores ; a perithecium (3) and G—the latter containing<br />
rudimentary asci ; piece of gonidiophore (J) with sterigma (a), and spore (6); K, branched gonidiophore of Penicillium glaucum<br />
bearing spores ; L, M, Sacclmromyces cenvisiee—cells budding ; N, the same showing the formation of endospores (after Hansen).<br />
Fig. 5. Protococcv.s viridis. a, Group of cells, the upper one with eight in a linear series ; those to the right {a'), dividing into<br />
numerous gonidia ; 6, zoospores set free from the cells by the solution of the cellulose membrane ; c, an isolated cell dividing, and<br />
about to set free its contents as two zoospores ; d, resting cells with a thick coat and reddish contents ; e, a zoospore with the cilia<br />
cast off ; /, zoospore with imperfect or retracted cilia, x 400 (after Griffith and Henfrey).<br />
Fig. 6.—Blood-corpuscles of the cray-fish (Astacus flumatilis), magnified 1000 diameters. 1 to 8 show the amoeboid movements<br />
occurring in a single corpuscle in a quarter of an hour ; 9 and 10 are corpuscles killed by magenta and having the nucleus deeply<br />
stained by the colouring matter ;<br />
n, nucleus (Huxley).<br />
Fig. 7. Trichina spiralis, magnified 50 diameters (after Dalton). Encysted worm occasionally found in human muscle, spirally<br />
coiled up.<br />
Fig. 8. Gromia terricola, greatly magnified (after Leidy). Shows an amazing display of sensitive living sarcode streaming and<br />
radiating by centrifugal movements from the body of the animal, which is encased in a horny shield. The streams of sarcode<br />
(pseudopodia) emerge from apertures in the shield ; they sometimes proceed in straight lines and sometimes branch and form<br />
networks. They seize whatever edible particles float in the water in which they are immersed and which come within their reach.<br />
These they quickly transfer to the interior of the body by centripetal movements. In the whole range of natural history there is no<br />
more remarkable example of aggressive, vital, purposive movements. The streaming of Gromia greatly resembles the streaming of<br />
the Plasmodium of the Mycetozoa. In both cases the movement is an active, aggressive, spontaneous one, essentially rhythmic in<br />
character, and consists of an advancing or centrifugal act (extension in space), and a retreating or centripetal act (retraction in<br />
space). The centrifugal and centripetal rhythmic movements, in one form or other, may be traced throughout the entire inorganic<br />
and organic kingdoms ; life without them would be impossible.<br />
The movements in question are seen in endosmose and exosmose, in the formation and disintegration of crystals, in the<br />
condensation and rarefaction of nebute, in cilia, in hollow and solid muscles, in respiration, alimentation, reproduction, circula-<br />
tion, &c. (Compare with Fig. 3 of Plate Ixxx.)<br />
Fig. 9. Ammba diffluens, commonly known as proteus from its continually changing its shape. It affords an example of the<br />
lowest animal form. Magnified 400 diameters (after Dallas and Jeftrey Bell). Consists of a granular jelly mass of sarcode with<br />
a contractile vesicle and nucleus seen at D, J, and G, but no other trace of structure. The amoeba possesses the remarkable power<br />
of assuming an infinite variety of shapes by rhythmic streaming, as indicated at A, B, C, D, E, F, G. This it does by alternately<br />
pushing out and withdrawing finger-like conical processes by centrifugal and centripetal movements, voluntary in character. The<br />
creature can slowly advance its whole body, or a portion thereof, in search of food, which, when found, is enveloped as seen at B.<br />
That portion of the body in contact with the food forms a temporary stomach. The animal can move to definite ends as in Gromia<br />
(Plate Ixxix., Fig. 8). It reproduces itself by simple division. The centrifugal and centripetal rhythmic movements have much<br />
significance when viewed in connection with similar movements occurring in the sarcous elements of muscles, in the movements of<br />
extension and flexion, and in the opening and closing of simple and compound hearts, as fully explained further on.