86 II. FUNDAMENTAL STRUCTURE OF PROTOPLASM 



ment of electrons, so that particles have to stand this hardship to 

 show their true figure without being decomposed. 



If the particles are disintegrated to fragments of a size beyond 

 the resolving power of the electron microscope, nothing will be photo- 

 graphed as in the case of blood cells shown in Fig. 13. However, if 

 fragments remain within the limit of resolution, their demonstration 

 under the electron microscope may be possible as indicated in Fig. 14. 

 In such a cavSe virus particles may be thought to be extremely small. 

 Furthermore, it may be possible that the particles present in the cell 

 surface are sometimes fused into a homogeneous membrane-like m.ass, 

 wherefore the so-called cell-membrane may be photographed (95). 

 Some workers claimed that even virus particles occasionally show a 

 membrane-like structure on the surface, which may likewise be a 

 dissolution product of protein molecules present on the surface. 



