XVI LIST OF ILLUSTRATIONS. 



FIG. PAGK 



24. Method of cutting sections 146 



25. Section-lifter 148 



26. Cork for supporting frog ...... 156 



27. Structure and position of tongue of toad . . . 159 



28. Injecting apparatus ....... 166 



29. Canulas for injecting 168 



30. Mercurial pressure apparatus for injecting . . . 178 



31. Perforated steel needle for puncture injection . . 179 



32. Tongue of rabbit ........ 282 



33. Ocular micrometer 286 



34. Lines of stage micrometer viewed with ocular micro- 



meter 287 



35. Camera lucida for drawing ...... 288 



36. Apparatus for mixing blood and for counting corpus- 



cles 289 



37. Stirling's microtome . . . . . . .291 



38. Hand microtome . . 292 



39. Rutherford's freezing microtome ..... 293 



40. Microphotographic apparatus 295 



