65 



It is also quite probable that the method of incubation has something 

 to do with the lime content of the chick and possibly with the vitality of 

 the chick. The five chicks from the Continuous Hatcher were, with one 

 exception, low in lime, and it was found that these chicks did not thrive 

 well; while all the chicks from the Prairie State machine, in which there 

 were lamp fumes, were high in lime and were strong and thrifty. 



From what has been noted in the two preceding- paragraphs, it is 

 quite evident that, in order to get results which shall give a strictly fair 

 and comparable basis on which to compare the merits of different methods 

 of incubation, a series of eggs must be selected such that it is possible 

 to have them appear in each incubator. It is also indicated, when the 

 June and July hatch are compared, that it is quite necessary to select this 

 series of eggs in as nearly the same season of the year as possible, or, in 

 other words, that fresh eggs should be selected for setting. 



The following table has been prepared to show the average lime 

 content of the chicks from the different methods of incubation, the amount 

 of carbon dioxide present, the percentage hatch, and the vitality of the 

 chicks as indicated by the percentage number alive at the end of four 

 weeks. In making up the average weight of lime in the chick all amounts 

 below .1600 grams have been discarded; because all chicks containing 

 less than that amount of lime were abnormally weak. 



Table No. XXVIII. Average Weight of Lime in Chicks With Different Methods 



of Incubatio.n". 



Method of Incubation. 



cm 

 o o 



9° 



■ — - © 



v 



5 

 - 35 a 



— 



t{. 



^o2 



.2-aTi 



~ C y . 



■C * B [0 



-w"S bo 



35 £ 2. 



e ® u.^: 



> 5 ** 



35 ■= ©.® 



o5 «*- •** 



June Hatch. 



Cyphers, dry 



Peerless, dry, hot water machine 



Continuous Hatcher. A little moisture . 

 Hen 



July Hatch. 



Model, buttermilk , 



Prairie State, lamp fumes, dry 



Prairie State, dry 



Prairie State, artificial C0 2 and H 2 used as 



moisture 



Prairie State, zenoleum and moisture 



Hen 



Average of hens set during whole season 



.1796 

 .1786 

 .1736 

 .1966 



.2047 

 .2056 

 .1930 



.1988 

 .2076 

 .2106 



8.22 



9.16 



10.70 



10.0 

 58.21 

 8.73 



51.42 

 7.26 



31.93 



46.1 

 60.2 

 58.0 



65.3 

 43.5 

 49.8 



57.08 

 62.0 



66.0 



23.05 

 52.86 

 53.0 



53.09 



36.5 



30.07 



49 1 

 54.0 



55.1 



*A11 eggs used for analyses. 



