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of Mr. Belt, Mr. Frank Finn, Mr. Lloyd Morgan and others. 

 The latter writer in his recent work on " Animal Behaviour " 

 (p. 165), after saying that further observation is unquestion- 

 ably needed, a statement with which we must all agree, 

 continued as follows : "It is not improbable, however, that 

 common protective coloration, such as the banding of yellow 

 and black, seen in such different forms as the caterpillar of 

 the cinnabar moth and the imago of the wasp, is of mutual 

 utility. The following experiment was made with young 

 chicks. Strips of orange and black paper were pasted beneath 

 glass slips, and on them meal moistened with quinine was 

 placed. On other plain slips meal moistened with water was 

 provided. The young birds soon learnt to avoid the bitter 

 meal, and then would not touch plain meal if it were offered 

 on the banded slip. And these birds, save in two instances, 

 refused to touch cinnabar caterpillars, which were new to their 

 experience. They did not, like other birds, have to learn 

 by particular trials that these caterpillars are unpleasant. 

 Their experience had already been gained through the banded 

 glass slips ; or so it seemed. I have also found that young 

 birds who had learned to avoid cinnabar caterpillars left 

 wasps untouched." It seems to me that this evidence is very 

 fairly conclusive, coming as it does from a writer who is a 

 cautious and by no means enthusiastic supporter of the 

 Miillerian theory : many further discoveries, moreover, bear- 

 ing upon the general question, have been made since he wrote 

 the account of the experiment above quoted ; these are in 

 great measure due to Professor Poulton, who has encouraged 

 collectors in different parts of the world to send him examples 

 of various orders of insects taken in one locality at the same 

 season of year, or, if possible, on the same day : the general 

 resemblance of colour between these has in many instances 

 been found to be most striking. I may perhaps be allowed 

 to quote the details of one series sent by Mr. Marshall from 

 Salisbury, Mashonalancl : the prevailing colour of all is yellow 

 or fulvous-yellow and black : even when arranged in a cabinet 

 it is evident that the greater number might easily be mistaken 

 for one another in life in their natural environment. The 

 following are the orders, etc., represented : — 



