142 The Ohio Journal of Science [Vol. XVIII, No. 4, 



than those in the feeding condition. This fact might be explained 

 in that the means of the feeding condition are in turn greater 

 than those of the before feeding condition, and as a result 

 lower the coefficients of variability in the feeding condition. 

 The pneumographic tracings of the feeding condition were 

 taken under fairly uniform conditions, because here the time 

 element was practically the same, since the tracings were made 

 at the regular feeding time. Therefore these results are very 

 significant and indicative of the degree of nervous activity or 

 reactiveness of the four animals. 



Lastly, taking up the after feeding polygons, (Fig. 3), we see 

 the results are somewhat different from those previously studied. 

 Taking into consideration the conformation and appearance of 

 the composites, the curves of Seven H indicate the least nervous 

 condition and next Three H, and Five H appears less active than 

 Two H. Turning to the actual results of the means and 

 standard deviations, the explanation for the difference will be 

 found. Seven H has a mean and standard deviation of 5.34 and 

 2.20, which are increased to 7.21 and 3.04 in Three H and to 9.09 

 and 3.45 in Two H, while in Five H the mean and standard 

 deviation decrease to 7.92 and 3.09 as compared to Two H. 

 This may be due again to the same time element, which was 

 explained above, when all the polygons of Five H were dis- 

 cussed. It is again brought out that the tracings of the after 

 feeding condition of this animal, were taken too far from the 

 regular feeding time, and so decreased the mean and standard of 

 deviation. While the coefficients of variability of the before 

 feeding and feeding conditions were in accordance with the 

 order of nervous activities of the animals, in the after feeding 

 condition they are not. They follow. Seven H, 41.20; Three H, 

 42.19; Two H, 38.02, and Five H, 39.08. Now here again the 

 time of taking the pneumographic tracings causes this result. 

 The after feeding polygons were taken in the morning, following 

 the morning feeding, but they were taken at various times and 

 not at a stated interval after feeding. This probably caused a 

 variation of results because of the changing nervous activities 

 of the animals, as the after feeding condition approached or 

 withdrew from the feeding time. 



