KELLICOTT: PERIODICITY IN ROOT OF ALLIUM 545 
and 7 a. m. and secondary minima at 5 a. m.and1p.m. These 
secondary maxima and minima are relatively much less marked 
than the primary waves and, occurring as they do so near to- 
gether, it is likely that they are to be considered properly as minor 
fluctuations on a broader maximal wave reaching its height (second- 
ary maximum) about 7 a. m. ; the secondary minimum would then 
be found about noon. The other irregularities in the curve are 
quite slight. 
The observations on some of the roots were made only bi- 
hourly, therefore for purposes of comparison later, we may write 
this curve as if observations had been made bi-hourly, as curze J, 
FIGURE 7. The result, of course, is to reduce the irregularities of 
the curve and slightly to alter the times of the apices of the princi- 
ANT 
A iF ‘\ ai 
464 Tok ~ Ls Fe ss 
1 iMAC pL TAA 
Pee Ne anne 
tit ie. $0: heme See ae Os ee A 25° 
t -| ati feet. sp bank chant 
Pa in; | ign 
; H ! ees Bea rst oh } | | 75° 
<a) he Se SA a ae 7 ee ee Sr ee ie Meee a ee eee 
p- mt. a. Mt. , m1. a.m. 
FIGURE 6. Elongation of root of A/- Ficure 7. Elongation of root of 4/- 
lium, ¢, temperature. lium. ¢, temperature. 
pal waves, e. ¢. the primary maximum now appears at 5 p. m. in- 
Stead of 4 p. m., the primary minimum at II p. m. instead of 10 
p. m. 
(0) Comparison of other observations. — Curve ITI, FIGURE 7, 
illustrates the rate of elongation of a root observed bi-hourly. 
The general appearance of this curve is somewhat modified from 
the fact that it was taken after the maximum of the grand period 
of growth had been passed and consequently the rate of elonga- 
tion is lower at the end than at the beginning of the observation. 
The actual hours of maxima and minima are, however, almost ex- 
actly as in the curve just described. That is, there are primary 
Maximal and minimal points at 5 p. m. and II p. m. respectively, 
and secondary maximal and minimal points at 7 a. m. and I p. m, 
The temperature varied more during this observation than during 
