56 RELATIVE WEIGHT AND VOLUME OF COMPONENT PARTS OF FETAL BRAIN. 



that the volume of the brain as embedded is from one-tenth to one-third less 

 than the original, depending on the character of the tissues and their reaction 

 to formalin, and on the dehydrating and embedding media. The extent of this 

 shrinkage for the individual brains I have at present no way of accurately deter- 

 mining. In spite of the fact that my figures are only approximate (probably one- 



TABLE 3. Data on the relative weight and volume of the subdivisions of the brain at various stages of development. 



With the exception of the two oldest stages, these data are based on wax-plate reconstructions. Where the structures 

 are bilaterally symmetrical the data for the right and left are combined. 



