BOTANY. 225 
Twenty flowers of F. EF, dusted with pollen of ¥. EF, EF. 
F, and EF. F, produced three fruits eS an average of 1°3 seeds. 
— EN 
EFF, EEF. FEF, ‘= REF 
On the other hand there were the following results with 
10 Flowers E EF impregnated bee Po and FE, es fruits 4 n 5 
11 EF; 1 4°6 
10 (23 «é F m 4.6 
Hoi “ e F. CF, and F. oms A5 
1 z & s6 FS, I “g 
The results following the dusting of the brothers and sisters 
were not owing to the bad behavior of the pollen since on other - 
plants it was completely potent; the pollen or F. EF, produced 
fruit rich in seeds in the plants FS, that of EF. F, on FE, that 
of EF. F, on F. Also the pollen of F. EF,, produced numerous 
seeds which so far as sown appear capable of germinating, from 
the plants F. F. OF,, F6, and FS,. 
The seeds produced by F. EF, and F. EF have, moreover, ger- 
minated and given strong plants which, up to this time; have kept 
pace in growth with those from EF,, F, F. CF,, and FS.. 
The foregoing examples, show that in hybrids of Abutilon, and 
probably so in pure species of the genns, there are many cases of 
more or less complete infertility between nearly related plant- 
. stocks, between parents and children, between brothers and sisters 
and even half brothers and sisters. If. the foregoing exposition — 
of the connection between relationship and fertility is correct, we 
eee May hope to indicate in other plants similar instances of dimin- 
_. ished fertility through too near raf but we may expect to 
VOL. VII 
AMER, P cesar OT 
