Ttirgor and of Temperature on Growth. 381 
Vicia Faba in water and in 1 per cent. KNO s . Total length 
of root, 25 mm. Temperature, 17-0°- 19-5° C. 
The transfer to the saltpetre solution is here followed by 
no noticeable contraction ; the growth is simply checked. 
The gradual recovery of growth in the salt-solution is com- 
plete in about i\ hours. The return to water is immediately 
followed by the elastic elongation due to the increased turgor- 
pressure. Of the 45 units of increased length seen, 25 are 
added during the 10 minutes following the change, seeming, 
therefore, to be, for the most part, due to the elastic extension 
TABLE x. 
Period. 
Growth. 
Medium. 
IO.30-II 
15-0 units of scale 
Water 
II-II.30 
13.0 
77 
77 
„ 
II.30-12 
16.0 
77 
77 
7 7 
12-2.30 
*14-0 
77 
77 
77 
2.30-3 
— 8.0 
» 
77 
1% KN0 3 
3-3-30 
6.0 
77 
7 7 
77 
3-30-4 
5*5 
77 
77 
77 
4-4-30 
4.0 
77 
77 
77 
4-30-5 
3*o 
77 
77 
5-5-30 
3-o 
77 
77 
77 
5-30-6 
2-0 
77 
77 
77 
6-6.30 
25-0 
77 
77 
Water 
6.30-7 
5-o 
>7 
77 
77 
7-7-3° 
2*0 
77 
77 
77 
* Rate per half-hour, i unit of scale = 0-0182 mm. 
caused by turgor. During the hour following the return to 
water, no retardation of the growth-rate is seen. That it may 
have occurred later had the experiment been prolonged is of 
course possible. 
For comparison with the above, the record of a root of 
Vicia Faba very similarly handled is given in Table X. Total 
length of root, 22 mm. Temperature, 20-o°-23-o° C. 
The contraction following the transfer to the solution of 
KN0 3 is here plainly marked. Indeed, it has an approxi- 
