17. 
18. 
19. 
20. 
21. 
22. 
23. 
24, 
31. 
32. 
3. 
34, 
35. 
36. 
37. 
38. 
39. 
Verzeichniss der erschienenen Arbeiten. 359 
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Chase, H. H. Amphipleura pellucida and other test-objects mounted in a medium 
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— Structure of the Diatom-Shell. Siliceous films too thin to show a broken edge. 
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-— Photography with high powers by lamplight illustrating structure of Diatoms, 
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Courroux, E. S. On Diatoms in the stomach of Mollusca and Crustacea. (Journ. 
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Delogne. Instrument pour op£erer le triage des diatomees sons des grossissements 
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Dippel, L. Mikrographische Mittheilungen. II. Bemerkungen über einige Probe- 
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