Investigation of the area of the surface of endocranial casts (fig. 1) overlying the cortex cerebri of modern and primitive man was begun at the suggestion of Dr. Frederick Tilney, who lent me the casts. Dr. William K. Gregory of the American Museum of Natural History also lent me a cast of a normal skull. Mr. Bell of the museum made the piece molds of these casts.
The problem of making a cast from these molds which could be precisely cut into slabs was difficult. Various mixtures of wax and paraffin were inappropriate. A knife would not cut them, and the mixture was too sticky to use with an electrically run band-saw. The saw was continually pulled off the wheel on which it ran.
After many attempts with various mixtures, the following formula and method was obtained which fulfilled all requirements:
KRAUS WM. THE MEASUREMENT OF CEREBRAL AND CEREBELLAR SURFACES: IV. A TECHNIC FOR MAKING ENDOCRANIAL CASTS SUITABLE FOR THE ESTIMATION OF THE INTERNAL SURFACE OF THE SKULL OVERLYING THE CORTEX CEREBRI. Arch NeurPsych. 1928;19(4):647–649. doi:10.1001/archneurpsyc.1928.02210100076006
Customize your JAMA Network experience by selecting one or more topics from the list below.