PLATE 1 



EXPLANATION OF FIGURES 



1 Early proliferation from the olfactory epithelium. Albino rat embryo, 

 age 12 days 6f hours; v. Rath technique; retouched photo. X 550. 



2 More extensive proliferation in embryo of same litter, v. Rath, technique; 

 photo. X 480. 



3 Early ramus ophthalmicus; (o) and ramus maxillaris {m). Same litter 

 and same technique; photo. X 150. 



4 Cells of the sphenopalatine ganglion. Albino rat embryo, age 15f days; 

 V. Rath, technique; photo. X 780. 



5 Cells among olfactory fila of same embryo; photo. X 780. 



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