xii LIST OF ILLUSTRATIONS 



FIO. J'ACE 



26. BUDDING OF A MARINE WORM - - 58 



27- BUDDING OF A SPONGE COLONY - - 59 



28. CONJUGATION OF NOCTILUCA - - 59 



29. CONJUGATION OF ZANARDINIA - - 60 



30. VOLVOX MINOR, WITH SEX CELLS - - 61 



31. A NORWEGIAN BRIDE - facing 86 



32. WOMAN OF SUMATRA IN BRIDAL DRESS - 87 



33. OVUM, SURROUNDED BY SPERM CELLS - - 90 



34. FERTILIZATION IN ASCARIS MEGALOCEPHALA - 91 



35. EMBRYOGENY OF SAGITTA - - 92 



36. HEN'S EGG : DIAGRAMMATIC LONGITUDINAL SECTION - 94 



37. METAMORPHOSIS OF A BUTTERFLY - - facing 94 



38. COCOONS, CHRYSALIS, AND MOTH OF SILKWORM - ,, 95 



39. STAGES IN THE DEVELOPMENT OF THE FROG - 95 



40. THREE SUCCESSIVE STAGES OF THE HUMAN EMBRYO - 99 



41. BUTTERFISH AND EGGS - - 115 



42. MIDWIFE TOAD - 117 



43. EMPEROR PENGUIN - - f acing 122 



44. NESTS OF WEAVER BIRDS - 123 



45. BROWN PELICAN FEEDING YOUNG - - ,, 124 



46. YOUNG FLAMINGOES FEEDING EACH OTHER - ,, 124 



47. WALLABY AND YOUNG - 128 



48. KOALA, OR AUSTRALIAN NATIVE BEAR, AND YOUNG ,, 129 



49. AMERICAN WOOLLY OPOSSUM WITH YOUNG - ,, 129 



50. SWAZIE MOTHER WITH CHILD 132 



51. ZULU WOMAN WITH CHILD, THRESHING CORN - 132 



52. WOMAN OF JAVA, WITH BOY - 133 



53. WOMAN CARRYING CRADLE AND CHILD - - 134 



54. ESQUIMO WOMAN WITH CHILD - - 135 



