135 



Fig. 10. Photomiciograplis of sections tluougli frozen gelatin gels. (From 

 Moran, 1926.) 



irregularly distributed in a non-frozen gelatin matrix (Fig. 

 10, B). Sections made through these granulations at - 11°, 

 with instruments maintained at that temperature, or at 

 higher temperatures, after fixation with f ormol, revealed a 

 structure consisting' of alternating concentric layers (Fig. 

 10, C ) . ]\[oran considers these layers as made respectively 

 of ice, and of dehydrated gelatin. 



Hardy (1926) studied Moran 's spheres in greater detail. 

 Layers of gelatin gels 0.5 mm. thick, containing the proper 

 amount of water, Avere mounted between slide and cover- 

 slip; they were, then, frozen at a convenient temperature 

 and observed in a low temperature room. The concentric 

 shells were seen to consist of two sorts of rings, one of 



