244 ]\[ATHEMATICA.L CONTRIBUTIONS TO THE THEORY OF EVOLUTION. 
[Note added November 29, 1898.—Dr. Warren Las made an experiment on two 
Naqada femora and kindly sent me the following results :— 
Femur I. Oblique 
Lenr/th. 
Femur II. Oblique Length. 
Wednesday, 1 p.m. 
. . 40‘82 
Tuesday, 
10 A.M. . . . 
44-31 
Put into water at 1 P.M. 
Put into water at 10 a.m. 
Wednesday, 7 p.m. 
. . 40-97 
Tuesday, 
12 A.M. . . . 
44-38 
Thursday, 10 a.m. 
. 41-00 
J5 
7.30 P.M. . . . 
44-42 
,, 7 P.M. . 
. . 41-00 
Wednesday, 
1 P.M. . . . 
44-47 
Friday, 10 a.m. 
. . 41-01 
5? 
7 P.M. . . . 
44-48 
„ 6 P.M. . 
. . 41-02 
Thursday, 
10 A.M. . . . 
44-50 
Saturday, 10 a.m. . 
. . 41-03 
Saturday, 
10 A.M. , . . 
44-53 
Monday, 10 a.m. 
. . 41-04 
Monday, 
10 A.M. . . . 
44-53 
Removed from water 
at 10 a.m. 
E.emoved from water at 11 a.m. 
Monday, 7 p.m. 
. . 41-04 
Monday, 
7 P.M. . . . 
44-53 
Tuesday, 10 a.m. 
. . 41-02 
Tuesday, 
10 A.M. . . . 
44-43 
„ 7.30 P.M. . 
. . 41-02 
Wednesday, 
10 A.M. . . . 
44-34 
Wednesday, 10 a.m. 
. . 40-96 
Thursday, 
10 A.M. . . . 
44-32 
Thursday, 10 a.m. 
. . 40-89 
Friday, 
7 P.M. . . . 
44-32 
Friday, 10 a.m. 
. . 40-87 
Saturday, 10 a.m. 
. . 40-82 
Monday, 10 a.m. 
. . 40-81 
Tuesday, 10 a.m. 
. . 40-80 
Wednesday, 10 a.m. 
. . 40-80 
Friday, 10 a.m. 
. . 40-80 
Thus there was a difference in the dr}^ and wet states of 2'4 and 2‘2 millims. 
respectively. Considering that the bones were some 3500 years older than those I 
experimented on, the agreement in result must be considered good. The maximum 
rate of expansion is reached in the first hour or two, and then gradually diminishes ; 
the maximum rate of contraction is not reached before about the second or third 
day, without artificial drying as in my case.] 
