xii ILLUSTRATIONS. 



FIG. PAGE 



28. Rotifer: Female 132 



29. Saccharomyccs cerevisia . . . . . . .141 



30. Bacillus anthracis ........ 143 



31. Volvox 147 



32. The Common House-fly (enlarged) . . . . 153 



33. The Ear in Vertical Section . . . . .166 



34. The Inner Ear 169 



35. Cave into which the Lesse disappears . 238 





