12 LIST OF ILLUSTRATIONS. 



FIGTJEE PAGE 



33. Mulatto mother with twins, one white and the other black. From a 



photograph. ....... 349 



34. Fecundated egg. (DALTON.) . 363 



35. Fecundated egg, with allantois nearly complete. (DALTOX.) . 363 



36. Fecundated egg, with allantois fully formed. (DALTOX.) . 369 



37. First development of the chick. (BRUCKE.) . . . . 390 



38. The same, farther advanced. (BRUCKE.) .... 390 



39. The same, still farther advanced. (BRUCKE.) . . .391 



40. First six cervical vertebrae of the embryon of a rabbit, one inch in 



length. (RoBix.) . . . . . .394 



41. Human embryon, about one month old. (DALTOX.) . . 395 



42. Development of the nervous system of the chick, after Wagner. 



(LONGET.) . . . . . . . 399 



43. Development of the spinal cord and brain of the human subject, after 



Tiedemann. (LONGET.) ..... 400 



44. Foetal pig, showing a loop of intestine forming an umbilical hernia. 



(DALTOX.) ' . . . . . . 406 



45. Development of the lungs, after Rathke and J. Mttller. (LONGET.) . 410 



46. Mouth of a human embryon of from twenty-five to twenty-eight 



days, after Coste. (SAPPEY.) ..... 414 



47. Mouth of a human embryon of thirty-five days, after Coste. (SAPPEY.) 415 



48. Mouth of an embryon of forty days, after Coste. (SAPPEY.) . 415 



49. Foetal pig, of an inch long. (DALTON.) . . . 421 



50. Diagrammatic representation of the genito-urinary system. (HENLE.) 425 



51. Transformation of the system of aortic arches into permanent arte- 



rial trunks, in mammalia, after Von Baer. (LONGET.) . . 433 



52. Diagram of the foetal circulation. (FLINT, JR.) . . . 440 



