13 
(iv) The experiments proposed to be done. 
‘The experiments proposed to be done are shown in a tabular 
form in an appendix. 
“The bags referred to will be made of two kinds of material (A) 
fine muslin, and (B) mosquito netting, but all will be of the same size, 
four feet by two feet, rectangular in shape. 
“ These bags are intended to be tied around selected branches of 
coffee-bushes for the various periods shown under the different experi- 
ments, to prevent pollination by particular insects at the different 
times quoted. 
[The letters (A) and (B) refer to experiments with muslin and 
mosquito-net bags, respectively. ] 
“ The experiments intended to be tried are— 
I. The bag to be applied before the buds open and kept applied 
during the whole flowering season, thus acting as a check on pollina- 
tion by (A) all insects and wind, and (B) all except minute insects. 
Il. The bag to be applied daily from dawn to dusk throughout 
the flowering season, the bag being removed and the flowers left 
exposed from dusk to dawn. This will act as a check on pollination 
by all day-flying insects. (A) and (B). 
III. The bag to be applied daily from dusk to dawn throughout 
the flowering season, the bag being removed and the flowers left 
exposed from dawn to dusk, thus checking pollination by crepuscular 
and nocturnal insects. (A) and (B). 
This experiment is the opposite of IT. 
IV. The bag to be applied daily from 7 a.m. to 5 p.m. throughout 
the flowering season, the bag being removed and the flowers left 
exposed from 5 p.m. to 7 a.M., thus checking pollination by honey-bees 
chiefly. (A) and (B). 
V. The bag to be applied daily from 8 a.m. to 4 p.m. throughout 
the flowering season, the bag being removed and the flowers left 
exposed from 4 P,m. to 8 a.m., thus checking pollination by all insects 
flying in the hot sun (e.g., mostly butterflies, syrphids, etc.). (A) 
iand. (B). 
VI. The bag to be applied daily from 4 Pu. to 10 P.M. 
‘throughout the flowering season, the bag being removed and the 
‘flowers exposed from 10 p.m. to 4 4.M., thus checking pollination by 
‘crepuscular insects (chiefly, sphingids). (A) and (B). 
VII. The bag to be applied daily from 8 p.m. to dawn throughout 
Ithe flowering season, the bag being removed from dawn to 8 r.m., thus 
checking pollination -by all nocturnal insects (A) and (B). 
Note.--1t would have been better to have applied these bags from 8 p.m. to 4 A.M., 
tout it would probably be difficult to get this done at 4.a.m. As a matter of fact, there 
seem to be very few insects about in the hills between 4.4.mM. and dawn. 
i VIII. Bag to be applied during the whole time that the flowers 
‘are out. The flowers of the enclosed branch to be pollinated by hand 
twith pollen from flowers on this same branch. 
