COLE. — IMAGE-FORMING POWERS OF VARIOUS TYPES OF EYES. 3G7 



1-3 



pa 



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from left to right ; it came from a 

 ventilator in the south wall of the 

 room, which was sometimes open, 

 sometimes closed. No record was 

 made as to whether it was open or 

 closed when the above experiments 

 were made ; but in the light of 

 subsequent experiments made to 

 test the effects of the draught the 

 records themselves seem to show 

 that it must have been closed. 

 This appears from the fact that, in 

 the experiments made to test the 

 effect of this current of air, it was 

 found that the worms were very 

 sensitive to it, and that in all 

 cases when the ventilator was open 

 the " mode " for the reaction was 

 pushed over to the right of the 

 class, the light being in these 

 tests purposely non-directive, as it 

 came from a lamp directly above 

 the normal axis of the circle. 



3. 



Mealworm {Larva of Tenehrio 

 molitor Linn.). 



The negative phototropism of 

 the mealworm has been commented 

 upon by Loeb (90, pp. 84, 85), 

 who found that these animals not 

 only moved away from the side 

 of a dish from which the light 

 came but that they remained in 

 the darkened half of the dish when 

 the plane between the dark and the 

 light portions coincided with the 

 direction of the rays. A few re- 

 sponses to a single light as used 

 in these experiments confirmed 

 Loeb's conclusions that the ani- 

 mals are markedly negative in 



