miscellaneous: stimuli underlying tumor-formation 565 



7 



It. ^fr" 



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i 

 A 



Fig. 424. — A, B, C. Portions of the inner (hypertrophiedj layer of the oak 

 gall highly magnified to show binucleate and multinucleate cells. In A at x 

 there is a nuclear fusion. In C at a; the nuclear substance is in seven pieces. 

 2 mm. apochromatic oil im. obj., No. 4 oc, bellows at about 40. X 850. (?) 



