LIGHT REACTIONS OF NEWT 35 



TABLE III 



Observations 123456789 10 



Facing light 8867767776 



A- A- A- S- A A A- A A- A- 

 Facingdark 3354.. 54442 



S S S S.. A-S-S-S S 

 In light end 7 6 4 5 7 5 6 8 4 4 



A A- A- A- A A- A- A- A A 

 In dark end 4 5 7 6 4 6 5 3 7 7 



S S- S S S A- S- S- S- S 



Observations 11 12 13 14 15 16 17 18 19 20 Total 



Facing light 5469868696 136 



a A A A- A- a A A A- a 

 Facing dark 4412343425 68 



S- S S S S S- S- S- S- S- 

 In light end 5467778676 119 



aAAA-AAAA a a 

 In dark end 6 7 5 4 4 4 3 5 4 5 101 



S-SSSSS-SSSS- 



Table III shows the results of a series of observations upon 

 the same eleven animals used in the preceding experiments, The 

 aquarium, containing a few inches of water, was entirely sur- 

 rounded by black except at the end which was towards the win- 

 dow, in this case twenty feet away. The day, while not dark, 

 was overcast, and the light that entered the open end of the 

 aquarium was naturally quite dim. When an animal, at the 

 instant of observation, lay at right angles to the direction of 

 the light it was not counted. It will be seen that exactly twice 

 as many animals faced towards the light as faced away from it, 

 while the number of animals in the half of the aqaurium near 

 the window was not very much greater than the number in the 

 other half. It will be noticed also that, as a rule, the animals 

 facing the light were more active than those facing in the other 

 direction, and that those in the half nearer the light were more 

 active than the others. 



This experiment shows that these salamanders are positively 

 phototactic even towards weak daylight., 



Experiment V. — This experiment or series of experiments was 

 to determine the reaction of the animals towards a much more 

 intense white light than the daylight of the preceding experi- 

 ment. The light here used was the same 25-watt, 115-volt 

 tungsten lamp that was used in experiment I; it was placed 

 six inches from the open end of the aquarium. The aquarium 



