62 MANUAL OF APICULTURE. 
value, besides a harvest in late summer for bees. It is also a fine 
ornamental tree. There are no finer shade or ornamental trees for 
the lawn or roadside than lindens (basswoods) and horse-chestnuts. 
To these locust, sourwood, and tulip trees may be added. The timber 
of all is useful; and since they are great honey yielders their propaga- 
tion near the apiary is very desirable. 
Bees range ordinarily within 2 or 3 miles in all directions from their 
homes, but sometimes go farther. Pasturage to be especially valuable, | 
however, should be within 2 miles, and less than a mile distant to 
the main source is quite preferable. The advantage is probably not so 
much in the saving of time in going back and forth, for bees fly with 
great rapidity, but because when sudden storms arise, especially those 
accompanied by high winds, the heavily laden bees are more likely to 
reach home safely and the hive will not be decimated of its gathering 
force. 
BEES AS CROSS-FERTILIZERS. 
Allusion has already been made in this bulletin to the importance of 
bees in the complete cross fertilization of fruit blossoms and to the fact 
that certain varieties of pears have been found to be completely self- 
sterile, requiring, therefore, pollen from other varieties before they can 
develop perfect seeds and fruits. It is interesting to study the ways 
in which cross fertilization of plants is secured through the visits of 
insects. The part that bees perform in the development and perpetua- 
tion of numerous ornamental and economie plants is thereby clearly 
shown. Space will only permit the introduction here of one or two 
examples. The willow-herb, which is an abundant secreter of nectar 
and thus attracts bees freely, illustrates one feature in pollination by 
bees. A young blossom of this plant (fig. 44, A) shows the stamens 
maturing and shedding their pollen, while the pistil remains curved 
downward and with closed stigmas. In the older flower (fig. 44, B), 
the stamens having shed their pollen and begun to wither, the pistil 
has straightened up and exposed its stigmatic surfaces for the recep- 
tion of the pollen which a bee chancing to come from a younger blossom 
is likely to bring. Self-pollination is thus positively prevented and 
cross fertilization is insured. 
In the mountain laurel the anthers are held securely by little pockets 
in the corolla, so that as the flower opens the stamens are found bent 
over (fig. 50, B) ready to be liberated (fig. 50, C) by the visit of a bee. 
When the stamen flies up the pollen is discharged from the anther and 
dusted on the underside of the bee. The latter as it alights on the 
next flower naturally touches the stigma first and rubs off some of the 
pollen it has brought from the last flower visited. It then proceeds to 
secure the nectar of the flower on which it has just alighted, and in 
doing this liberates the stamens of this flower and gets dusted again 
with pollen, which it carries to the next flower. : 
The cross section of an imperfectly developed apple shown herewith 
(fig. 51, B) illustrates the importance of complete fertilization of fruit 
