278 ON THE ATTRACTION OF FLOWERS FOR INSECTS. 
72 to B 83 to F 
73 „, B $4 „ F 
74 , B 85 , F 
75 „ B 86 „ F 
76 , B 87 , B 
7 , B 88 , B 
7 , B S9 , B 
79 „ F 90 , B 
80 , F 9] , B 
sl „ F 92 , F 
$2 , F 93 , B 
In these 93 visits, therefore, the Bee came 60 times to the 
honey near the bract, and 33 times to that near the flower-head 
itself. 
I then applied the same test, placing, however, the drops of 
honey, with the flower-head and the bracts respectively, near the 
bed containing the growing plants and moving them about after 
each visit. Sixteen Bees came to the honey near the bracts, seven 
to that near the flower-head. 
These observations go far, I think, to disprove Prof. Plateau's 
conclusion. 
Such observations need to be made with much care, and it is 
not safe to assume that the senses of animals are exactly similar 
to ours. For instance, saccharine and sugar have to us the same 
sweet taste. I, myself, am quite unable to distinguish them. 
I, however, placed side by side two saucers containing water 
sweetened (1) by sugar and (2) by saccharine, and found that 
while Bees and Ants thoroughly enjoyed the first, they would 
not touch the second. 
In conclusion, then, I submit that the observations made by 
Prof. Plateau do not at all weaken the view that the colours as 
well as the scent of flowers serve to attract Insects and guide 
them to the honey, in securing which they confer upon the 
plants the great advantage of eross-fertilization. 
