vn.1   DISCUSSION OF THE DATA OF STATURE.   107

contrived more than one form of apparatus by which the probable stature of the children of known parents can be mechanically reckoned. Fig. 12 is a representation of one of them, that is worked with pulleys and weights. A, B, and C are three thin wheels with grooves round their edges. They are screwed together so as to form a single piece that turns easily on its axis. The weights M and F are attached to either end of a thread that passes over the movable pulley D. The pulley itself hangs

from a thread which is wrapped   HCIOHT D

IN MCHEM

two or three times round the   MALE FEMALE MALE

groove of B and is then secured   0   0 =

z

to the wheel. The weight SD   -1 A   n

FIG .12.

TO FORECAST STATURE

oer'~Fvl

hangs from a thread that is   75- - 70 - -75

wrapped two or three times round

the groove of A, and is then

7J

secured to the wheel. The diameter of A is to that of B as 2

MB

to 3. Lastly, a thread is wrapped   69- -- 60 -   65

in the opposite direction round

the wheel C, which may have   so-   -so

- ss -

any convenient diameter, and is

attached to a counterpoise. M refers to the male statures,
F to the female ones, S to the Sons, D to the Daughters.
The scale of Female Statures differs from that of the
Males, each Female height being laid down in the
position which would be occupied by its male equivalent.

W

G

111