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To COLLEGE OF AGRICULTURE UNIVEI3TY OF WISCONSIN 6 MADISON y B52 CONTENTS PAGE PREFACE
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absorb actual hatching air-space appearance artiﬁcial hatching artiﬁcial incubation artiﬁcial means artiﬁcial methods bad hatch beginner beneﬁt birds bottom carbonic acid gas carefully cause of bad cent circulatory system Clinical thermometers cold weather course of incubation cubator dead germ dead in shell difﬁcult egg chamber egg drawer egg tray embryo enters the machine Fahrenheit feeding fertile eggs ﬁnd ﬁrst test ﬁxed ﬂame ﬂannel ﬂoating ﬂue foster-mothers fowls future chick hatchers hatching and rearing hatching chickens heat I03 degrees incubator room infertile inﬂuence large number Maize male birds methods of hatching natural methods necessary nest novice number of eggs obtained once a day operator period of incubation Posr FREE 1/8 possible Poultry World poultry-keepers practical PRICE proﬁt proper reason regulating removed rule scientiﬁc side stage of incubation sufﬁcient temperature test the eggs testing lamp tion turning the eggs variation ventilation water-tray weakly yolk