566 Willis and Bur kill. — Flowers and 
but still the lilac-blue flowers remain those which get fewest 
of the decidedly desirable insects. 
TABLE XXIII. 
Apis- 
Bomb. 
B 
ffi 
Phyt. 
Entom. 
Ants. 
Wasps, 
Lep.l. 
Lep.m. 
Lep.s 
s 
p 
< A 
Q 
15 
U 
d 
W 
Campanula 


12.82 
I * 7 I 
_ 

I - 7 I 
•85 
4.27 
63-25 
_ 
15-39 
Other blue-lilac flowers . 
i -45 
13.04 
i -45 
— 
— 
18-84 
i -45 
2.90 
2- 90 
44-93 
8.70 
4-35 
Rose-purple 
12.09 
54-13 
.19 
•38 
2.30 
8.45 
•77 
— 
4.99 
7-10 
7-10 
2.50 
Yellow 
17.24 
19.02 
•39 
.98 
- 
10-00 
.20 
• 20 
i -1 8 
25.69 
6-86 
18.24 
White 
27*93 
30-00 
•34 
I.03 
1862 
— 
— 
6-90 
8.97 
5.86 
•34 
In our enumeration of visitors, and in Table XX, we have 
taken the flowers of Class H in such order that first come 
those with erect actinomorphic flowers, secondly those with 
horizontal zygomorphic flowers, and thirdly, those with pendent 
actinomorphic flowers. We may add to them the three flowers 
of Class F — one erect actinomorphic and two horizontal zygo- 
morphic — whereupon we get : — 
1. Six erect actinomorphic in which to reach the honey 
a tongue 4-16 mm. long is required, average 10 mm. 
2. Thirty-eight horizontal zygomorphic in which to reach 
the honey a tongue 4-20 mm. long is required, average 8 mm. 
3. Thirteen pendent actinomorphic in which to reach the 
honey a tongue 1-7 mm. long is required, average 4-5 mm. 
It is very easy to show that a greater exclusion of the 
undesirable or little desirable insects is effected by the simple 
inversion of the flower than by lengthening the tube. 
TABLE XXIV. 
Effect of the position of the flower upon the groups of the visitors. 
Apis. 
Bomb. 
s 
a 
Entom. 
Phyt. 
Ants. 
Wasps. 
Lep.l. 
Lep.m, 
Lep.s. 
S 
Q 
C/3 
Q 
0 
O 
d 
w 
Erect . . . 
_ 
5-10 

_ 
25 - 5 1 
3-06 
— 
8.16 
27'55 
23-47 
7.14 
Horizontal . 
23-57 
I9.OI 
•39 
.65 
— 
964 
.26 
•39 
2.29 
22.01 
7.81 
13.28 
Pendent . . 
8.11 
50-55 
2.65 
• 62 
2-34 
9-83 
•47 
.16 
4-37 
16.07 
1.87 
2.96 
