xvi ILLUSTRATIONS 



KIO. 1'AOK 



147. Median longitudinal section of an early human ovum, O4 mm. in length 491 



148. Diagram of the earliest human ovum hitherto described 494 

 14!i. Section through the wall of the uterus in the early part of pregnancy 495 

 l.~)(i. Section of a portion of the wall of the human blastocyst - 496 



151. Section of a portion of the necrotic zone of the decidua, etc. 4'.(7 



152. Section through embryonic region of ovum - 498 



153. Condition of the glands at the beginning of pregnancy in man - 499 

 l.Vi. Median longitudinal section of embryo of 2 mm. 500 



155. Diagram of stage in development of human placenta 501 



156. Fat in a villus of human placenta - 504 

 |.~>7. Iron granules in a villus of the placenta in man - ."><)<; 

 158. The first stage in the revolution of the equine fretus ">i;.s 

 I.V.I. The foal in the normal position for delivery ~>i; ( .i 



160. Virginal external os (human) 583 



161. Parous external os (human) - .~>83 



162. Section of mammary gland of woman 589 



163. Section of mammary gland (human) during lactation .V.tn 



164. Section of mammary gland (human) in full activity 591 



165. Section through an alveolus with fat drops in cells ,V.i-_' 



166. Section of developing mammary gland of horse 606 



167. Section of mammary gland (human), showing developing alveoli 607 



168. Photograph of mammary tissue of virgin rabbit - (117 



169. Photograph of mammary tissue of pseudo-pregnant rabbit Iil7 



170. Masculinisation of guinea-pig 696 



171. Feminisation of guinea-pig - t;;i7 



172. Feminised guinea-pig with large protruding teats and small penis t',*)8 



173. Normal male guinea-pig with rudimentary teats and large penis - 698 

 174-180. Diagrams from Minot's Problem of Ay, (Iron-tli, am/ ])ith - 7'>4-71<> 



181. Growth of sheep - 711 



182. Growth of boys and girls - - 711 



183. Section through ovary of woman of fifty-six, showing degeneration of 



follicles, etc. - 716 



184. Section through uterine mucous membrane of woman of sixty - 717 



185. Section through vaginal mucous membrane of woman of sixty-one - 718 



186. Group of nerve-cells from the first cervical ganglion of a child at birth - 719 



187. Group of nerve-cells from the first cervical ganglion of a man of 



ninety-two - 720 



188. Land tortoise aged at least eighty-six, belonging to M. Klir Mctdinikotl' 7-' 



189. Lonk sheep aged eighteen years, with her last lamb - 723 



