202 



Artificial Incubation. 



[JULY, 



year, when the outside temperature was go deg. F. — but in no 

 case did the air in the room fall below 41 deg. F. To this fact 

 must be attributed much of the success attained. As seen by 

 Diagram II., the lowest percentage of hatching was in August, 

 1905 (64"68), when the variations of room temperature were 

 at their narrowest (77 deg. F. max. to 62 deg. F. min.), which 



1905 ~~ IT T&oir I ~ ~' 



A?-RiL May Jumc July August S cpt Oct Nov/ Dec Jan. fca Harch 



'KoOtI iCtlPLKAT U-RL OyrSIOE. TlMPrR,! jjre; HuMIBITy 



VflT'./ATIONS - 

 OoTStDC 



bZ-Zd iS-iX. &5-U.l> qo-ifX 2/-oy 60-20 S^'Zo ^^-J.S i'h-^S Si-Xo ii-i^ 



i>? - $-1^ db'G^ Vy-^i -sy C>r-c+y bJ.-Cf.'5 6,i'i+2> fe^f-v-S ff-^Q) 



■ii ' it-q _ki>-^9 79-56 78-56 St-5t? So-fc? f'+'Si 86-«^8 yS-n i,y-0. 



Fig. I. — ^\^ARiATiONS OF Temperature and Humidity in the Incubator House. 



might suggest that warm nights are less favourable than cool ; 

 but this is not borne out by the second lowest percentage 

 month, February, 1906 (66-41), for then the temperature was 

 much below, ranging from 69 deg. F. to 50 deg, F. In the 

 highest month, September, 1905 (83*47 per cent.) the variations 

 were from 75 deg. F. to 57 deg. F. We must look in other 



