ELECTROiN MICROSCOPY 



Fig. 25. Sequence from a cine film showing the 

 growth of filaments from irradiated silver iodide 

 particles. 



large. Furthermore, the size, shape and struc- 

 ture of particles vary considerably from 

 material to material. No attempt has been 

 made in this article to cover all the work 

 carried out on colloidal particles nor to con- 

 sider in detail the question of general mor- 

 phology. This subject has been reviewed 

 elsewhere (56) and it was concluded that the 

 morphological forms in which colloidal par- 

 ticles are formed could be subdivided into 

 amorphous small particles, small regular 

 forms (spheres, cubes, hexagons, octahedra, 

 etc.), fibers and plates. Most of these forms 

 have been described in this article but the 

 main emphasis has been laid upon the de- 

 scription of techniques which enable any 

 colloidal particle to be examined in the elec- 

 tron microscope. 



Acknowledgments. It is a pleasure to record my 

 thanks to Mr. R. W. Home for his continuous en- 

 thusiastic collaboration in much of the work 

 described in this article. I should also like to 

 express my thanks to Drs. I. M. Dawson, G. F. 

 Hamilton and A. Watillon for generously supply- 

 ing the micrographs acknowledged in the text. 



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