THE INCUBATION OF THE EGG 211 



same in both cases, while the advantage in weight of the 

 moisture chicks was so slight as to be practically negligible. 

 It should also be noted that in the case of the moisture 

 chicks, evaporation was much restricted as compared with the 

 calculated normal loss. (Calculations from Table XXIII.) 



Table XXIV. — Result op Incubating with and without Moistube. 



Lewis^ found that under Massachusetts conditions in 

 a cellar showing an average relative humidity of 60 per cent., 

 increasing the moisture content of the air in the incubator 

 by means of sand trays increased the percentage hatch, 

 produced chicks which weighed more at hatching and were 

 more vigorous, and brought about a greater uniformity in 

 hatching. Unfortunately neither the evaporation nor the 

 relative humidity were recorded. 



Graham^ reports that under Ontario conditions, of all eggs 

 set, 11.2 per cent, more were hatched when moisture was 

 supplied than when it was not, and further that on an 

 average, for every one hundred eggs set there were 16.6 per 

 cent, more chicks living at the age of four weeks that were 

 hatched in moisture machines than in the case of those 

 hatched in non-moisture machines. Here again there is 

 no indication of the per cent, of relative humidity. 



In Oregon' Dryden secured the results shown in Table 

 XXV. 



1 New Jersey Experiment Station Report, 1911. 



' Ontario Bulletin No. 163. ' Oregon Bulletin No. 100. 



