ranging from a low of 1.11 percent for the 60 foot candles, 24 hours group, 

 to a high of 2.22 percent for the 60 foot candles. 12 hours group. The com- 

 bined summary analyses of variance (Table 5) shows none of the differ- 

 ences in mortality between the various groups to be significant. 



Table 4. The Effect of Light Intensity and Daily Light Dosage Upon Co- 



elKeients of Variability in 10 Weeks Weights (Combined 



Average of Sexes) 



* Two experiment? only 



Light Dosage Average: 12 Hours 8.81; 24 Hours 8.89; 



Intensity Average: 15 foot candles 8.89; 60 foot candles 9.04; 120 foot candles 8.62 



Coefficienls of Variability 



Table 4 presents the coefficients of variability based upon the individual 

 body weights of males and females. The lower figures indicate greater uni- 

 formity of body weight. The group receiving 120 foot candles w^th 24 

 hours of light had the lowest figure (8.07) while the 15 foot candles with 

 24 hours had the highest figure (9.4.5). The combined analyses of variance 

 summary of the coefficients of variability ( Table 5 1 shows that none of 

 the differences were significant. 



Effect Lfpon Feather Score 



As indicated in the Procedure of the Investigation, each bird was scored 

 at 10 weeks of age on back feathering, with a feather score ranging from 

 one for complete feathering on the back, to four for a completely bare- 

 backed bird. In none of the experiments did a single bare-backed bird show 

 up. 



9 



