ILLUSTRATIONS. 



vn 



ILLUSTRATIONS. 



FIG. PAGE 



1. A Pocket-lens. 3 



2. A Compound Micro- 



scope 9 



3. A Growing-slide '36 



4. Air-bubbles 38 



5. Reflector for Drawing 



the Magnified Object 40 



6. Leaf of Ranunculus 



aquatilis 47 



7. Pedunfele of Nymphsea 



odorata; transverse sec- . 



tion 48 



8. Whorl of Myriophyllum 



Leaves 49 



g. A I^eaf of Utricularia. . 51 



10. Quadrifid Process from 

 Inner Surface of Utri- 

 cle of Utricularia 53 



11: Whorl of Leaves of Cer- 



atophyllum 54 



12. Lemna polyrrhiza 55 



13. Lemna Minor 55 



14. Anacharis Canadensis. . 56 



15. Portion of Leaf of 



Sphagnum 58 



16. Riccia fluitans 60 



17. Didymoprium Grevillii. 72 



18. Sphserozosma pulchrum 72 

 ig. Hyalotheca dissiliens.. 73 



FIG. PAGE 



20. Bambusina Brebissonii. 73 



21. Desmidium Swartzii. . . . 73 



22. Closterium lineatum ... 74 



23. Closterium juncidum . . . 75 



24. Closterium acerosum ... 75 



25. Closterium Lunula. ... 75 



26. Closterium Ehrenbergii 75 



27. Closterium acuminatum 75 



28. Closterium Dianse 76 



2g. Closterium Venus 76 



30. Closterium rostratum. . . 76 



31. Closterium setaceum ., . 76 



32. Micrasterias radiosa . . . . 77 



33. Micrasterias rotata 78 



34. Micrasterias truncata. . . 78 



35. Micrasterias arcuata. . . 78 



36. Micrasterias dichotoma.' 78 



37. Micrasterias Kitchelii. . 78 

 38; Micrasterias oscitans. . . 7g 

 3g. Micrasterias laticeps. . . 79 



40. Euastrum crassum 80 



41. Euastrum did^lta 80 



42. Euastrum ansatum 80 



43. Tetmemorus granulatus 80 



44. Tetmemorus Brebissonii 80 



45. Docidium Baculum . . . . 81 



46. Docidium crenulatum . . 81 



47. Cosmarium Ralfsii 81 



48. Cosmarium pyramidatum 81 



