120 BOTANICAL GAZETTE [aucusT 
the size of the fruit. I believe that in such cases the analytical 
methods of modern higher statistics applied to large bodies of data 
are fitted to give results of real value. 
The purpose of the present paper is to present the results of an 
attempt to measure the intensity of the interrelationship between the 
length of the pod and (a) the number of ovules formed, (#) the number 
of seeds developing, and. (c) the fecundity, that is, the ratio of number 
of seeds developing to number of ovules formed per pod, in Cercis | 
canadensis. 
As material for a first study, the number of ovules formed and the 
number of seeds developing per pod were counted and the length 
measured in 3,000 pods, collected at Meramec Highlands, St. Louis, 
Missouri, in the autumn of 1905. To secure as representative 
material as possible, 50 pods from each of 60 individuals were taken. 
The measurements of pod length were taken to the nearest milli- 
meter, and then grouped in classes of three millimeter range for pul 
poses of calculation. 
ABLE I 
FERTILITY AND LENGTH OF POD FOR 3,000 Cercis FRUITS 
3 
PS PERE EIS ELE EL E/E] S/F HEE EI - 
belo} Sle) 31 2 Sl &l el els] sisal sissies 
HPN ake 4 sis Etta) Sere Pela bs ; 
aoa: 3 vf Gee | Neer | cae | as aes I . . 
aA ae a ae Ss Gs : 
Sho Fe a Or Sh of Be ah aj 2 I a 
a x} 2) 8} x6) 30] 24] 27] 1x8] 14 4 I 4 
* a heer I b i 2 e Si 8 me Me or vs ror 
io vot Sb OL” By Sal. 36) sal, ae 7 I 
mr be a 4 ae 7 Bit ys Sees A a\ 56). S77] S71, 24 8 4 309 
I Ay ite) Bee fee 48} 78] 04] 102} 99] 60} go} 13! 5 I 
I I 5 I = a 2 2 y a 
t] 2] -S) x4]. 281 ar]. 20) 76} 22} 10 2 I x 420 
1} 1 3] 413] 22] 54] 7o| 74) 48} 33] 10) 3| 8 * : 577 
“ie 17| 30} 58] 115} 115] 96} 50) 48] 20] 11 * 3 
I ro eee Bs I I 18 
‘ ny te aaa poe Yea eae | ee : 83 
I be | 4} 10] 22] 16 ° 6 2 2 x] 135 
4) St Sl 1G) agi 36] 30) 20) 16) 5| 6 = a| 224 
4; 3| 10} 22| 38) 45) 38) 2s5| rol 7} 4) 3) 4 I 
<ul cas I ° Ke ° 
eS ee =f 8 
I ; 1 I OCS cei 
1 I ONS. | Geen 2 a Shi Si 4h +s “bos 
poe Mea 2 si. 5 3 AR (etn eg Won Sane] SE 
4| 2] 9} 30 51| 147] 255] 3rs| 301| 474| 487] 357| 232] 137| 47| 39] 6| 7) 7| 3 Ge 
Seen are 
Table I gives the data. In the first column to the left the number 
of ovules formed and the number of seeds developing pet pod ate 
NOR te 
