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EXPLANATION OF PLATES XIII—XX. 
All the figures, except ligs. 104 to 111, represent various stages in the development of Lepto- 
theca ohlmacheri. The figures were drawn with the aid of Abbe’s drawing apparatus at the level 
of the base of the microscope, with the combinations of Zeiss’ compensation oculars 8 and 12 and 
homogeneous oil immersion objective 2 mm., thus obtaining magnifications of about 1500 and 
-350 diameters respectively. Figs. 1 to 86, 88 to 95 and 101 to 111, were magnified 2350, and the 
rest 1500 diameters. The abbreviations used in the explanation are as follows: B., Bouin fixation; 
from the kidnej^s of Rana clarnitans; D., staining with Delaficld’s haematox^dm; F., 4 per cent, 
formol fixation; G. , staining with Giemsa’s solution, followed by acetone dehydration and mounted 
in cedar oil; II., staining with Heidenhain’s iron haematoxylin; JR, from the kidneys of Rana 
pipiens-, S^j section preparations;^Sa., Schaudinn’s fixation; Sm., smear preparations; Tcs., thickly 
made smears; Tns., thin smears.' 
PLATE XIII. 
Fig. 1. A spore treated for 30 minutes with the gastric fluid of the frog in a hanging drop prepara¬ 
tion, showing the fusion of the two sporoplasms. P.Tns.Sa.G. 
Figs. 2, .3. Two views of a spore which was kept for 2 hours in the stomach fluid of the frog 
animal (/ ), drawn from a fresh hanging drop preparation. The two sporoplasms fused into 
one mass and are seen pressing the polar capsules against the anterior margin of the spore 
membrane. P. 
Fig. 4. Another spore treated like the last one for 6 hours, showing the binucleate amoebula 
emerging through the opening made by the separation of the shell-valves. The empty polar 
capsules lost their spherical form under the pressure of the amoebula. The greater portion 
of the filaments are not shown. P.Tns.Sa.G. 
