46 AGE, GROWTH, AND DEATH 



various classes. This whole phenomenon of cell 

 change is comprehensively designated by the single 











:; 



FIG. 9. THREE TRANSVERSE SECTIONS THROUGH A RABBIT EMBRYO OF 

 SEVEN AND ONE HALF DAYS, from series 622 of the Harvard Embryological 

 Collection. A, section 247 across the anterior part of the germinal area. 

 B, section 260 across the middle region of the germinal area. C, section 381 

 through the posterior part of the germinal area. Magnified 300 diameters. 



word, cytomorphosis, which is derived from two 

 Greek words meaning cell and form, respectively. 



