LIST OF PLATES. 
PLATE XV. 
To FACE PAGE 
Fic. 1. Coscrnopiscus Ocuius Irrpis, by dark-ground illu- 
mination ; magnified two hundred diameters . i 
Fic. 2. The same diatom (Coscinodiscus Oculus Iridis) ; magni- 
fied three hundred diameters . . . . ... 
PLATE XVI. 
Navicuta Lyra; magnified eight hundred diameters 
PLATE XVII. 
Fig. 1. Aprpose TIssuE or Ox; magnified fifty diameters . 
Fig. 2. RouNnD-cELLED Sarcoma; magnified one hundred 
diameters . 
PLATE XVIII. 
Fic. 1. Parasitz or GREYHOUND; magnified thirty-five diam- 
eters a we ae ee ee ee ee ee ee ee 
Fic. 2, PEDICULUS VESTMENTI ; magnified twelve diameters . 
PLATE XIX. 
Fic. 1. Tick or HEDGEHOG ; magnified twelve diameters . 
Fig. 2. Parasite or BEETLE; magnified twelve diameters 
Fic, 3. Parasire or Hovserty; magnified one hundred 
diameters « 2 4 4 ow 2% & & @ 4 8 % 
Fic. 4. Parasite or Bat; magnified fifty diameters 
PLATE XX. 
Fig. 1. Treru or SnaIL; magnified eighty diameters . 
Fic. 2. TRACHE& oF SILKWORM; magnified fifteen diameters 
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