Donaldson, Growth of Central Nervous System. 363 



T r 



"T r 



SPINAL CORD WEIGHT 



BRAIN WEIGHT 



Chart 4. The base line represents the brain weights from 0.20 to 2.00 grams. The corresponding 

 values for the spinal cord weights are measured on the ordinates, and shown by a theoretical curve (con- 

 tinuous line) determined by formulae [i] and [3] and also shown by a series of dots indicating the observed 

 mean values (see table 8). 



TABLE 8. 



Showing the mean weight of the spinal cord both observed and calculated through 

 the range of brain weights in groups differing in brain weight by o.l gm. 



