1>LATE VII. 
Fig 9. — Red blood-corpuscles of the human subject divided into smaller 
portions by pressure. A needle was firmly drawn across the thin glass 
covering the corpuscles; many of those in the line of pressure were 
divided, and every particle resulting from the division instantly assumed the 
spherical or stellate form, as represented in the figure. An ordinary red 
blood-corpuscle is seen in the upper part — magnified 1800 diameters. 
This fact shows that the red blood-corpuscle consists of 
viscid semifluid material, portions of which, when suspended 
in fluid, may assume the crystalline form. 
Eig. 10. — Young red blood-corpuscles from human blood, showing the 
colourless germinal matter moving away from the coloured formed material 
— magnifiied 1800 diameters. 
The germinal matter of the remaining figures was coloured 
red by an ammoniacal solution of carmine. The depth of 
the tint is shown by the darkness of the shading. 
Fig. 11 is a very small and young frog's blood-corpuscle. The 
outer matter has not yet undergone conversion into the coloured formed 
material. It exhibits two outgrowths or protusions, of precisely the same 
nature as those seen in the living mucus-corpuscle, pus-corpuscle, and 
young epithelial cells (see Plate IX, fig. 15, in last number) — magnified 
1800 diameters. 
Fig. 12. — A frog's blood-corpuscle, in which the outer part is undergoiug 
conversion into coloured formed material — magnified 1800 diameters. 
Fig. 13. — Another very small corpuscle, in which the formation of a 
small quantity of the coloured matter is complete — magnifi.ed 1800 
diameters. 
Fig. 11. — Another corpuscle showing the same point, but magnified only 
700 diameters. In this and some other corpuscles it might be said that a 
nucleus, nucleolus, and nucleolulus exist. 
Fig. 15, 16. — Different stages in the formation of the red blood-corpuscle 
of the frog. The youngest particles would be called small white blood- 
corpuscles. They are entirely coloured by carmine. 
Fig. 17. — Alteration in form of the outer coloured portion. 
Fig. 18. — Movement of germinal matter towards the surface of the 
coloured formed material. 
Fig. 19. — An ordinary fully formed but young blood-corpuscle of the 
frog, in which the nucleus (mass of germinal matter) is large. 
Fig. 20. — Another corpuscle, in which the mass of germinal matter has 
subdivided into smaller ]3ortions. 
Figs. 21, 22. — Old blood-corpuscles of the frog. The coloured matter 
is so condensed that it does not become spherical, as in the case of the young 
corpuscles (figs. 14, 16, 18, 19, 20, 23), when placed in moderately strong 
glycerine, but retains its ordinary oval form. 
Contrast the small mass of germinal matter in proportion to the formed 
material, in these old corpuscles, with the large mass which forms the 
greater part of the bulk of the young frog's blood-corpuscles (figs. 11 to 16). 
Fig. 23. — Germinal matter collecting towards the surface, and about to 
•divide into separate portions. 
Figs. 24, 25. — Corpuscles in which (he germinal matter has separated 
into small portions, some of which have escaped through the viscid red 
matter in the surrounding fluid. 
Figs. 15 to 24 magnified 700 diameters. 
