686 General Notes. [ November, 
A: B. C. D. Total. Increase. 
Oth, 10 Acei esos 1.85 1.6 1.4 2.15 7.0 20 
TE Pies es ck 2.0 1.65 1.4 2.35 7.4 A 
10th, 10 A. M.........66- 2. 1.65 1.4 2.45 7.5 1 
BO Be Med Bo te cong ae 1.65 1.4 2.45 7.5 0 
11th, 10 A. M...... +. eee 2.0 1.65 1.45 2.55 7.65 5 
12th, 10 A. M..... 1.2.0 2.15 E 1.5 2.75 8.1 45 
dar MARS OERE 2.15 Er 1.5 2.75 8.1 0 
Path IO Acie? iso vee 28 1.75 1.5 2.75 8.2 Be 
IUP e eee 1.75 1.5 2.75 8.2 0 
Starting from the measurement at ten P. M. on February 27th, the 
lowest of the three zones, which then measured 0.1 in., had increased 
by March 13th so as to make up the two zones C and D together 4.25 
in., or 4150 per cent. of. its original length, while the remainder had 
only increased from 1.0 to 3.95, or at the rate of 295 per cent. Again, 
starting from ten P. M. on March 29th, when the four zones were first 
marked off, the ultimate increase of the lowest was from 0.2 to 2.75 
in., or 1275 per cent.; the next greatest energy was displayed by the 
uppermost, which increased from 0.55 to 2.2, or just 300 per cent. ; next 
came the second zone from the top, which showed an increase from 0.5 
to 1.75, or 250 per cent.; and finally the third from the top, showing an 
increase from 0.5 to 1.5 in., or exactly 200 per cent. The rate of 
growth was again subject to great irregularities, which were no doubt 
attributable mainly to changes in temperature. Making the division be- 
tween day and night as before at ten A. M. and ten P. M., the total 
amount of growth was again not very different in the two; but instead 
of being, as in the previous case, slightly in favor of the day, was rather 
more decidedly in favor of the night ; of the 6.5 in. growth from Febru- 
ary 29th to March 13th, 3 inches was by day, and 3.5 inches by night. 
It will therefore be seen that, as far as these observations on the rela- 
tive growth of different portions of the same internode go, they are 
entirely in accord with the statement of Professor Sachs, in regard to 
that of different int des on the same branch, that the maximum energy 
of growth is exhibited at a period considerably below the punctum vege- 
tationis, though it is here much nearer the base than in the cases meas- 
ured by Sachs. This brings out into still stronger relief the opposite 
phenomenon displayed by the elongated submerged flower-stalk of Val 
lisneria, the energy of growth of which is manifested mainly in the apical 
portion. The elongation of the peduncle of the hyacint 
siderably after the complete expansion of the flowers, 
in the raceme begin to fade. 
These observations differ in several points fro 
stalk of the hyacinth recorded by Miinter in the Botanise 
February 24, 1843. He describes its growth as not centri 
that of most flower-stalks, but centripetal; that is, it ceases to 
first near the flower and finally at the base. It will be seen that Mr. 
Bennett’s two experiments agree in this, that while the energy of growth 
until the lowest 
m those on the flower- 
fugal, like 
g row 
he Zeitung for 
