FIGURE 1.167. HEAD OF A SHARK-EMBRYO.
FIGURES 1.168 AND 1.169. HEAD OF A CHICK-EMBRYO.
FIGURE 1.170. HEAD OF A DOG-EMBRYO.
FIGURE 1.171. HUMAN EMBRYO OF THE FOURTH WEEK.
FIGURE 1.172. SECTION OF SHOULDER OF CHICK-EMBRYO.
FIGURE 1.173. SECTION OF PELVIC REGION OF CHICK-EMBRYO.
FIGURE 1.174. DEVELOPMENT OF THE LIZARD'S LEGS.
FIGURE 1.175. HUMAN-EMBRYO FIVE WEEKS OLD.
FIGURES 1.176 TO 1.178. EMBRYOS OF THE BAT.
FIGURE 1.179. HUMAN EMBRYOS.