THE CROWN GALL: CAUSE 



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FIG. 325. Crown-gall tumor-strand in coarse-celled cortical parenchyma of 

 a Pelargonium teratoma. Diffuse tumor tissue with tracheids at the right and 

 lower left. From a pure-culture inoculation. Slide stained by Lucia McCulloch. 

 Photomicrographed by the writer. 



