SENSE ORGANS 



119 



TABLE 79k— Continued 



Order of viyelination in the nervous sysle?n of the rat^Vatson {'03) 

 Cerebrum 



Capsula externa 



Fibrae longitudinales dorsales. 



Stria olfactoria lateralis 



Corpus striatum 



Corpus callosum 



Radiations into the cortex. 

 Commissura anterior 



Thalamus. . . 

 Zonal layer. 



MYELINATION BEGINS: 



days 

 11 



13 



14 

 14 

 14 



14 

 17 



17 



(?) (but certainly 

 not before the 

 42nd day) 



Rapid 



Slow 



Verj^ rapid 



Rapid 



Very slow until 

 after the 24th 

 day 



Development ex- 

 tremely slow 



Very slow until 

 after the 24th 

 day 



Slow 



7. /Sense organs. Eye. Collins ('22) has given a few measure- 

 ments on the eyeball, cornea and the lens of the rat — table 80. 



TABLE SO 

 Measurements on the eye 



TABLE 81 

 Common rat- — mature cochlea 



