LIBER X · CAPUT 31
THE TIMES OF INCUBATION OF BIRDS
Latine · Mayhoff 1906
Oscines praeter exceptas non temere fetus faciunt ante aequinoctium vernum aut post autunmale, ante solstitium autem dubios, post solstitium vitales.
English · Bostock & Riley 1855–57
The birds that have a note, with the exception of those previously mentioned, do not by any chance produce their young before the vernal or after the autumnal equinox. As to the broods produced before the summer solstice, it is very doubtful if they will survive, but those hatched after it thrive well.