39. Skulls of Ducks, viewed laterally, reduced to two-thirds of the natural size ... [282]
40. Cervical Vertebræ of Ducks, of natural size ... [283]
41. Pods of the Common Pea ... [328]
42. Peach and Almond Stones, of natural size, viewed edgeways ... [337]
43. Plum Stones, of natural size, viewed laterally ... [345]
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