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MARGARET R. LEWIS AND WARREN H. LEWIS 



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Fig. 2 A, sketch of living cell with nucleus and mitochondria, the cytoplasm 

 should be homogenous, h, the same cell after exposure to the vapor of 12 per 

 cent acetic acid; both cj^toplasm and nucleus show reticular structure due to 

 coagulation; the mitochondria are destroyed except for a few granular remains. 

 Fig. 3 Changes in shape of mitochondria as observed in living cells; «, changes 

 by bending during a period of 4 minutes; 6, by shortening and elongating and 

 shifting along the mitochondrium of the mitochondrial substance, time 6 minutes; 

 c, by fusion of granules; in the course of 7 minutes the four granules a, b, c, d 

 became fused into two granules ab and cd; a, b, c from a 2-day culture of mesen- 

 chyme from a 4|-day chick; d, changes in shape and fusion of mitochondria to 

 form network in the course of 6 minutes; e, changes in shape and fusion, 2 minutes; 

 /, changes in form of a single mitochondrium during a period of 7 minutes; d, e 

 and / from a 3-day culture of mesenchyme from a 4:-day chick. 



