CONTENTS xi 



PAGE 



Fibrous Protoplasm ..... 255 



(7) Theories concerning the Causes of Radiate Appearances . 257 



6. The Homogeneous Protoplasm and the Alveolar Theory . 262 



7. The Phenomena of Protoplasmic Movement in their 



Relation to the Alveolar Structure . . . 267 



(a) Theories as to the Causes of the Phenomena of Movement 267 



(b) So-called Contractility . . . . .267 

 (c} Contractility of the alleged Reticular Framework . 269 

 (d} Objections to the Theory of Contractility . . 270 

 (e) Hypotheses of Hofmeister, Sachs, and Engelmann . 271 



(/) Electrical Hypotheses of Vel ten and Fol . . . 279 



(g) Leydig's View of the so-called Hyaloplasm . . 280 



(h) Montgomery's Hypothesis .... 287 



(i) Hypotheses relating to Surface Tension - - Berthold, 



Quincke . . . . . .289 



(/) My own View of the Explanation of Amceboid Move- 

 ment ...... 307 



On the Currents in the Water surrounding Amcebse, 



etc. ....... 317 



(&) Independent Movements of Granules . . .319 



(I) Causes of Internal Displacements in the Alveolar Proto- 

 plasm . . . . . .323 



(w) Possibility of an Explanation of Muscular Contraction in 



this Way ...... 325 



(n) Rotational Currents in Plant Cells . . . 327 



LITERATURE ........ 331 



EXPLANATION OF THE PLATES ...... 341 



INDEX . ... 367 



