164 INTELLIGENT BEHAVIOUR. 
determines the situation for the fox terrier; the particular 
animal has never entered into his past experience: it is the 
fulfilment of the essential conditions of the generic image that 
is operative in behaviour. The experience of animals must 
inevitably become in large degree generic by the elimination 
of the unessential and survival in re-presentative consciousness 
of the salient elements in many slightly diverse situations. 
Stated in terms of this conception, the familiar phenomena 
of mimicry are due to the fact that the mimicking form accords 
sufficiently well with the generic image to be taken as a 
representative thereof. As is well known, the model has been 
proved in many cases to be unpalatable or hurtful, while the 
mimic is in itself neither the one nor the other. The drone- 
fly, Hristalis, mimics the drone. And it has been urged that 
this cannot be a true case of mimicry, since the drone is harm- 
less, though the female and “neuter” bees are possessed of stings. 
But I have satisfied myself by experiments with young birds, that 
(1) after experience with bees drones are avoided, and (2) that 
after similar experience drone-flies are also left untouched. 
Hence it seems that all three fall within the same generic image, 
the points of resemblance outweighing the differences in detail 
—as they do, indeed, with many men and women. 
Such examples of mimicry belong to what is known as the 
“Batesian type ”"—so called after HL. W. Bates, who, in 1861, 
discussed its occurrence among Amazonian insects in the light 
of the theory of natural selection. There are, however, certain 
groups of insects which, although themselves ‘“ protected,” 
possess common warning colours, causing them to resemble 
each other. These are sometimes classed under the head of 
“‘Mullerian mimicry ”’—so called after Fritz Miller, who, in 
1879, first offered an explanation of the facts based on the 
theory of natural selection. He suggested that such mutual 
resemblance is advantageous to both protected forms, since it 
lessens the number of those which are killed by young birds 
and other animals while they are learning by experience what 
to eat and what to leave. For, as the result of careful 
observation, Mr. Frank Finn concludes ‘that each bird has 
