PART 111.] THE MECHANISMS OF FLOWERS. 381 
_ Delpino and Hildebrand on the contrary, point out rightly that 
i t he floral mechanism of Kalmia leads to cross-fertilisation in case 
of insect-visits ; they both maintain, in opposition to Hasskarl, that 
in K. latifolia the anthers cannot spontaneously release themselves 
from their pouches. According to Delpino, the filaments are sticky 
_ at the base in this species, so that they cling to an insect which 
We has inserted its head into the flower, and are ‘pulled up by it when 
it leaves (178, 360). 
The fertilisation of K. angustifolia and K. latifolia by the hive-bee 
a: and other Hymenoptera, had been observed and described two years 
Fig. 125.—Loiseleuria procumbens, L. 
A.—Young flower, viewed obliquely from above. The stigma is mature, the anthers still closed. 
B.—Ditto, in section. 
C.—A slightly older flower, in section. The stigma is mature, the anthers have dehisced. 
Stles pe older flower, from above. The stigma is withered, the anthers are still covered with 
Pe eaiiels, Alpenrose, June 22, 23, er 
Before by Professor W. J. Beal. The insect alights on the style, and 
turning round upon it, applies its proboscis successively to the 
outer sides of the filaments to obtain the honey which is secreted 
_ there abundantly. In doing so, it sets free the stamens with its 
legs, and generally receives the charge of pollen upon its body. 
If insects are excluded from the plant by means of a net, the 
flowers wither and fall off without the stamens being set free. 
