LIGHT REACTIONS OF NEWT 37 



that of the animals facing away from the light; and that the 

 animals in the near half of the aquarium were, as a rule, more 

 active than those in the half farther from the light. As before, 

 animals which lay, at the moment of observation, with the long 

 axis at right angles to the direction of the rays of light were 

 not counted. The total number of animals facing the light was 

 298, to 90 that faced away from the light; the number in the 

 near half of the aquarium was 244, to 163 in the half farther 

 from, the light. 



Experiment VI. — Another series of 25 observations, taken 

 every five minutes, under conditions similar to those just de- 

 scribed, except that the aquarium was in an ordinary room and 

 covered with the same black cloth, gave 200 facing the light 

 to 78 facing away from the light, and 179 in the near end to 

 97 in the far end of the aquarium. 



Experiment VII. — Still another series of 30 observations, 

 taken every five minutes, was made upon nine of the same animals 

 after having been in the dark for 32 days except for about two 

 and one-half hours three days before the present experiment. 

 This was to determine if prolonged residence in total darkness 

 had any effect upon their reaction to white light. The arrange- 

 ment of the apparatus was the same as in experiment V. One 

 hundred and ninety-seven animals were found facing the light, 

 to 72 facing away from the light; 202 were in the near half, 

 to 74 in the far half of the aquarium. 



It will be seen by comparison with experiment V that, after 

 this long residence in darkness, the preponderance of animals 

 that faced the light over those that faced in the opposite direc- 

 tion was less than in animals that had been in the light; while 

 the preponderance of animals in the near half of the aquarium 

 over those found in the distant half was greater in animals 

 that had been in the dark than in those that had been in the 

 light. It is possible that these differences may have been due 

 to other causes than the prolonged residence in the dark. 



Experiment VIII. — To see whether the same eleven animals 

 were positively phototactic to a light of even greater intensity 

 than the tungsten the aquarium, covered as before, with a black 



