161] 



THE GOLDFISH AS A TEST ANIMAL— POWERS 



41 



graphs the weight of the goldfish is not taken into consideration. The gold- 

 fish with the shortest survival time is always considered first, the second 

 next, and so on. Small variations in the weight of the goldfish had very httle 

 effect on their survival time, though in general the smaller died first. Of all 

 goldfish killed the smaller died first in the ratio of 2.1 to 1. Where there was 

 a greater variation in size the smaller died first in a much greater proportion. 

 For variations of the survival time of the goldfish as compared to their relative 

 weights see Tables I to XXXVI. In all the tables the smallest goldfish is 

 placed first, the next smallest second, and so on. 



Minutes 

 200 



100 



11111111 

 Figure 21. Graph showing the efl&ciency of the goldfish as a test animal, 

 represents the survival time in minutes and abscissa represents individual fish 

 Dot and dash line =0.284 N. CaCU 

 Solid line = 0.274 N.SrCk 

 Dotted line = 0.2 14 BaClz 

 Broken line =0.272 N. LiCl 



Ordinate 



Minutes 

 200 



100 



11111111 

 Figure 22. Graph showing the efficiency of the goldfish as a test animal 

 Broken line = 0.222 N. NH4CI ^ 



Dot and dash line = 0.229 N. NH4CI 

 Solid line = 0.3 18 N. MgClj 

 Dotted line =0.231 N. KCl 





