224 PRACTICAL COURSE IN BOTANY 
332 333 
Fics. 331-333. — Flower of Lorillard tomato: 331, newly opened bud, showing 
stage in which the stamens should be removed; 332, mature flower: cz, calyx; c, 
corolla; s, stamens; st, stigma; 333, flower with stamens removed for pollination. 
(Natural size.) 
of wind or insects. Watch until seeds are matured. Which flower pro- 
duces the more seeds or the better ones? Plant the seeds; which produce 
the more vigorous progeny ? 
EXPERIMENT 79. CAN A FLOWER BE FERTILIZED WITH POLLEN OF A 
DIFFERENT KIND ? — Dust the stigma of a tulip or a lily, from which the 
stamens have been removed, with pollen from a narcissus, iris, or amaryl- 
lis. Cover to protect from wind and insects. Are any seeds produced ? 
Experiments of this kind, to be conclusive, ought to be performed on 
a sufficient number of plants and through at least three generations. This 
is hardly practicable for class work, but students who are specially inter- 
ested in the subject may carry on experiments at home, or supply their 
place, to some extent, by observations out of doors, if there are any farms 
or gardens accessible. 
254. Self-fertiliza- bu > c— Gs 
tion takes place 
whenastigma is @ Ge Or] 
pollinated from the 
same flower. Hor- 
; : &> <3 
ticulturists have CD &> 
long known that 
. Vv, 
continued self- t > €S> Sa» i 
fertilization, or ‘“in- 
breeding”’ as it is is Ou» fos 
called by nursery- ao 335 
men, tends to dete- Fras. 334-335. — Seeds of Bartlett pear, showing 
: the advantage of cross-fertilization : 334, cross- 
riorate a stock; but fertilized; 335, sclf-fertilized, 
