140 ON THE GROWTH OF THE HYACINTH FLOWER-STALK. 
А В C D Total. Increase. 
КОЮ S. и... 45 45 -4 "75 2-05 1 
А... -5 45 -45 8 22 15 
SIX 2. -5 5 45 -95 2-4 :3 
ШЕРИ Ны, 5 5 5 1:0 2:5 `1 
March 186, ли ........ Dw D 59 5 1.2 2.8 3 
11252 ee `6 55 5 1°25 9:9 1 
Оне, IDEEN ues -65 6 -55 із 8-1 "92 
о. у б 65 "55 1:35 3°25 15 
IR РАҚ... ‘75 65 "6 1-5 3:5 95. 
SEMIS eens ies ‘75 7 $ ү 3:75 :35 
ДО жи 521.22... 8 xi 6 1-9 40 25 
ZR IAM. а... 8 75 “75 2.2 4-5 “5 
о... “85 8 "8 28 4-75 25 
БЫ АИ о. -85 8 "8 9:8 4-75 ; 
РИ у у t. 9 9 “85 2:35 5-0 :25 
АЕ... ‘95 "9 9 2:5 5:25 "25 
Bras оо. 1:0 9 "9 № 5:5 “25 
ТШ. ЧО MONS ROME лы сол 1:0 9 "9 9-75 5-55 :05 
ҮК... 1:0 9 95 2-9 5°75 2 
ӨШ, Fe AMS оаа. 1:05 "9 1:0 8:0 6:0 :25 
о Ве Г Т, ы. 1-1 1:0 1:0 3:15 6:25 “25 
Oth; Тоха UT 11 1:0 1:0 9:3 6:3 :05 
Hby3952.2i0 c5 1:15 1-0 1:0 8-25 6-4 1 
TO MODO IM 1:15 1:0 1:0 8-4 6-55 15 
А... D 1-0 1:0 8-45 6:6 “05 
ЕСЕГЕ cU 1:15 1-0 1:0 3°45 6-5 ‘0 
It will be seen from the above table that by far the greatest total energy of growth 
was displayed by the lowest of the four segments, which increased during the twelve days 
between Feb. 26th and March 10th from 0-4 to 3:45 in., or 762°5 per cent. of its original 
length. The next greatest energy, but at a great interval, was exhibited by the apical 
section, which increased from 0°35 to 1:15, or 228 per cent., while the two central 
portions exhibited the least activity, increasing only from 0:4 to 1:0, or 150 per cent. of 
their original length. Dividing the peduncle into an upper and a lower half, and 
constructing the “ Curve of Growth” in the same manner as those given for Vallisneria 
(p. 137), the accompanying diagram (Curve A) represents the results diagrammatically. 
On the ordinates, again, 1 in. represents a growth of 1 per cent. per hour on the length at 
the commencement of each interval; but each inch on the line of abscissee represents а 
period, not of 12 but of 24 hours. Іп order, therefore, to compare the curve of growth 
of the Hyacinth with that of Vallisneria, the former ought to be flattened out so as to 
occupy twice the space. It will be seen that the rate of growth was subject to great 
variations on different days, dependent, no doubt, on the temperature and other causes. 
Making the division between day and night at 10 a.m. and 10 р.М., the growth was 
nearly equally divided between them, the 5 inches growth between Feb. 26th and 
March 10th being accounted for by about 2:65 in the daytime and 2:35 at night. 
