CONTENTS 



Inteodtjction . 



PAGE 



1 



PAET I 



Observations ........ 



A. Investigations upon Oil-Foams ..... 



1. Preparation and Structure of the Foams . 



2. Some more exact Statements as to the Alterations in 



Volume of the Drops of Foam under the Influence 

 of the surrounding Fluid . . . 



3. Radiate Appearances in the Drops of Oil-Foam 



4. Fibrous Structures in Drops of Oil-Foam . 



5. The Durability of the Oil-Foams .... 



6. The Phenomena of Streaming Movement exhibited by the 



Oil-Foams ...... 



7. The probable Explanation of the Streaming Movements 



exhibited by the Drops of Foam 



8. Streaming Movements exhibited byT)rops of Foam in Cells 



9. Eemarks upon Frommann's Experiments on Drops of Oil- 



Foam .... 



B. Investigations upon Protoplasmic Structures 



1. Investigations upon Protozoa 



Suctoria .... 



Ciliata 



Flagellata . 



Radiolaria. 



Heliozoa .... 



Marine Ehizopoda with Calcareous Shells and Reticulate 



Pseudopodia . 

 Gromia Dujardini, M. Sohultze . 



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47 



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94 

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