168 the negative geotropism of the periwinkle 



Table 5 



TIME OF 



IMMERSION 



HOURS 



"IMMERSED" 

 GROUP 



"DRY" GROUP 



RESPONSE PER 



ANIMAL PER TEN 



MINUTES 



CENTIMETERS 



RESPONSE PER 

 ANIMAL PER TEN 

 MINUTES 

 CENTIMETERS 



(Normal) 



14.6 



5.3 



104 



10.6 



2.9 



263 



15.4 



2.1 



329 



8.8 



4.4 



521 



13.2 



2.5 



618 



16.1 



5.1 



759 



15.7 



1.2 



927 



17.7 



4.8 



1344 



13.1 



1.8 



1380 



3.4 



3 1 



It seems at least a probability on the basis of these results, 

 that there is an increase in negative geotropism resulting from 

 continued immersion. The 1380 hour result may be discarded 

 as totally out of harmony with the remainder. Starvation and 

 overcrowding for 57 days had doubtless begun to show an effect, 

 this hypothesis being sustained by the 1344 hour result, which 

 gives a slight indication of a lowering of activity. 



With the exception of the 329 hour group which varies 

 radically, there is a clear gradient upwards to the 927 hour 

 reading in the "immersed" group. 



The "dry" group varies erratically as it does in the othei" 

 experiments, a result which will be treated of elsewhere. 



