GUINEVERE THE MYSTERIOUS 138 
bian. One noticeable thing was their segregation, 
whether in the mica pools, or in two other smaller 
ones near by, in which I found them. Each held 
a pure culture of Redfins, and I found that this 
was no accident, but aided and enforced by the 
tads themselves. Twice, while I watched them, 
I saw definite pursuit of an alien pollywog,—the 
larva of the Scarlet-thighed Leaf-walker (Phyl- 
lobates inguinalis) ,—which fled headlong. The 
second time the attack was so persistent that the 
lesser tadpole leaped from the water, wriggled 
its way to a damp heap of leaves, and slipped 
down between them. For tadpoles to take such 
action as this was as reasonable as for an orchid 
to push a fellow blossom aside on the approach 
of a fertilizing hawk-moth. This momentary co- 
operation, and the concerted elimination of the 
undesired tadpole, affected me as the thought of 
the first consciousness of power of synchronous 
rhythm coming to ape men: it seemed a spark of 
tadpole genius—an adumbration of possibilities 
which now would end in the dull consciousness 
of the future frog, but which might, in past ages, 
have been a vital link in the development of an 
ancestral Ereops. 
My Redfins were assuredly no common tad- 
