378 THE FERTILISATION OF FLOWERS. [PART I 
3 mm. long, and cleft into four lobes to near its base. Honey 
is secreted by eight blackish glands in the base of the flowe: 
alternating with the stamens, and is easily accessible to short- 
lipped insects. What the plant loses in attractiveness by the s 
Fig. 123.—Erica earnea, L. 
A.—Bud for next year, inclosed in the calyx (x 7). 
B.—Ditto, after removal of two sepals. pe 
C.—Ditto, after removal of the whole calyx and half the corolla. Three of the eight stamens 
have been drawn out (x 7). 
D. — Pollen-tetrads from a bud, greatly magnified. (Bergiin, September 5, 1878.) 
‘ E.— spelen ga in side view (x 7). The flowers usually do not hang vertically, t but only inclined 
ownwards 
F.—Ditto, after removal of half of the stamens and corolla. 
G.—Mouth of flower. 
H.—Essential organs, in their natural position ; the stamens have sprung slightly outwards on 
removal of the corolla. 
J Ae ; inner, outer, and lateral view. 
(E, F, G, Lenz, June 1; H, J, Bergiin, June 2, 1879). 
size of its corolla, it makes up by the red colour and large size 
of the sepals, and by association of the flowers in long, almost 
uninterrupted groups. Calluaa vulgaris is visited by at least as 
many insects as Hrica tetralix, and by a greater variety owing to 
