Xll 



LIST OF ILLUSTRATIONS. 



29. Group of Hydractinia echinaia, with gonophores 



30. Trophosome of Clytia Johnstoni, 



31. Free Medusoid of Clytia yohnstoni, 



32. Development of ^«r^//a, . 



33. Generative zooid of Chrysaora, 



34. Bean Aphis, .... 



35. Male organs and pollen of Flowering Plants, 



36. Female organs of Flowering Plants, 



37. Fructifying Frond, Spore- cases, Spore, and 



Fern, ..... 



38. Molecules and bacteria of organic infusions, 



39. Ideal section of the Crust of the Earth . 



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