...7 nest on December 28 (incubationperiod thirty-four days)... 
George Murray Levick 「Antarctic Penguins」
...Usuallythey will be dried so that they can be movedon the afternoon of the 28th day of incubation...
Harry M. Lamon 「Ducks and Geese」
...Methods of Incubation...
Harry M. Lamon 「Ducks and Geese」
...Period of Incubation...
Harry M. Lamon 「Ducks and Geese」
...With the Anis one nest serves for several females who may depositas many as thirty eggs, incubation and the care of the youngbeing subsequently shared by the members of this singular family...
Frank M. Chapman 「Color Key to North American Birds」
...The period of incubation (that is, the time between the exposure of ananimal to infection and the development of the disease) is variable, usuallyfrom three to six days...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Gerlach, having collected the statistics from 133 cases, has found this time,known as the period of incubation, to vary from 14 to 285 days...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The stage of incubation is from three to five days...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...In about thirty-sixhours from the beginning of incubation it will be found that the germhas turned red, and little red veins radiate from it somewhat like thelegs of a spider...
John H. Robinson 「Our Domestic Birds」
...The period of incubation isabout four weeks...
John H. Robinson 「Our Domestic Birds」
...The period of incubation is from thirty to thirty-five days...
John H. Robinson 「Our Domestic Birds」
...The period of incubation is four weeks...
John H. Robinson 「Our Domestic Birds」
...The period of incubation for guinea eggs is four weeks...
John H. Robinson 「Our Domestic Birds」
...The period of incubation is two weeks...
John H. Robinson 「Our Domestic Birds」
...As it is, after fourteen days' incubation, the eggsare hatched simultaneously, or nearly so, the Cuckoo being generallythe first...
Rev. C. A. Johns 「British Birds in their Haunts」
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