DAILY RHYTHMS IN CERTAIN ROOTS 
Table 5. Allium Cepa (Seed). 
Grouping of Maxima and Minima of Elongation. Four- 
Wave Type 
Plant 
276. 
277. 
273- 
279. 
283. 
5 A.M. 
9 A.M. 
9 A.M. 
9 A.M. 
9 A.M. 
II A.M. 
I P.M. 
I P.M. 
I P.M. 
I P.M. 
7 P.M. 
7 P.M. 
7 P.M. 
7 P.M. 
7 P.M. 
I A.M. 
5 A.M. 
I A.M. 
3 A.M. 
3 A. . 
7 A.M. 
II A.M. 
II A.M. 
II A.M. 
II A.M. 
5 P.M. 
9 
P.M. 
5 P.M. 
I 
P.M. 
5 P.M. 
9 
P.M. 
3 P.M. 
9 
P.M. 
3 P.M. 
9 
P.M. 
3 A.M. 
7 A.M. 
3 A.M. 
7 A.M. 
7 A.M. 
Summary 
Maxima 5-9 A.M. (11 A.M.) 1-3 P.M. 7 P.M. 1-5 A.M. 
Minima (7) 11 A.M. 3-5 P.M. 9 P.M. (i A.M.) 3-7 A.M. 
has attained its third maximum. A similar comparison of curves 281 and 
283 shows again how similar in general character are the curves of the two^ 
types. In curve 276 the extra wave appears in the hours just preceding andi 
just following midnight, while in 283 the extra wave is only a very low- 
crested one and appears during the forenoon. In table 5 the maxima and 
minima of five different curves of the four wave type are grouped. It is 
seen that these curves are very similar and that there is very little over- 
la^pping of times of maxima and minima. In table 6 the summary of these 
Table 6. Allium Cepa {Seed). Comparison of Maxima and Mi?iima of Elongation in 
Four-wave Curves zuith those of Three Waves 
Four-wave type 
See table 5 
Three-wave type 
275 
280 
286 
288 
281 
Four-wave type 
See table 5 
Three-wave type 
275 
280 
286 
288 
-9 A.M. 
5 A.M. 
5 A.M. 
7 A.M. 
5 A.M. 
(7) II A.M. 
Maxima 
II A.M.-3 P.M. 
I P.M. 
II A.M. 
II A.M. 
9 A.M. 
Minima 
3-5 P.M. 
7 P.M. 1-5 A.M. 
7 P.M. 
5 P.M. 3 A.M. 
7 P.M. 
5 P.M. II P.M. 
5 P.M. 
9 A.M. 
3 P.M. 
I P.M. 
5 P.M. 
3 P.M. 
9 P.M. (I A.M.) 
I A.M. 
9 P.M. 
9 P.M. 
7 P.M. 
II P.M. 
-7 A.M. 
7 A.M. 
7 A.M. 
7 A.M. 
5 A.M. 
7 A.M. 
curves is compared with five different curves of the three-wave type. 
It will thus be seen that the three-wave curves are, as individuals, very 
similar to those of the four-wave type, but differ among themselves prim- 
arily as to which of the waves (present in the four-wave curves) is omitted. 
The seeds for this work began germination at 9 A.M. 
Cucurbita Pepo. Space will not permit so extensive a discussion as 
given above for Pisum, Lupinus, and Allium. Nothing unlike what we 
have already seen above was found in the study of this species. Curves 
