epiphysed'(           e     osig- oint a     -  e e1  1-4he-humenus
M-sxomade     at the end of the Aunting season (suially 7.    ). This
we have not yet done, for such proof necessitates the rearing, (or
banding and recapture) of young of known early birth. Table 1,
however, shows that same humeri (presumeably the latest-born) per-
sisted open until early January; hence it seems probable that the
humerus is reliable in November, but perhaps not in December. :e
are publishing at this stage in the hope that others will join in
the final verification of the 4bshthe humerus ceases to be
individually accurate for classifying a population.
Changes in the architecture of the skeleton do not cease
abruptly with the replacement of the epiphyseal cartilage by/bone.
Reorganization of the pattern of the bony trabeculae continues for
same tine after fusionzand such changes can also be used to
classify for age. No attempt was made in this studyt however, to
collect suitable material, or to extend the(teete)beyond the stage
of fusion of the epiphysis to the diaphysis.
It should be pointed out that, in several instances, the gross
staining procedure showed tho proconce of cartilag;e in spite of a
negative result by the x-ray method. This is becoause the epiphyseal
cartilage is not usually a flat plate, as is     diagramatically in-
dicated, but is irregularly cone shaped. There is, therefore,an
overlapping of bone and cartilage-y hiki-pneerebe4-ee      recorded
on the film by the x-rays. Such films are difficult to read
accurately when the relative annount of cartilage present is snall.
The epiphyseal cartilge at the upper end of the tibia, however,
s aat plate1  e                  perhaps the most
satisfactory single regio  or    w=tata.
The weight figures in Table 1 indicate that the females are on