The periods of gestation are the same in Horse and Ass, 11 months each; Camel, 12 months; Elephant, 2 years; Lion, 5 months; Buffalo, 12 months; Cow, 9 months; Sheep, 5 months; Reindeer, 8 months; Monkey, 7 months; Bear, 6 months; Sow, 4 months; Dog, 9 weeks; Cat, 8 weeks; Rabbit, 4 weeks; Guinea Pig, 3 weeks; Wolf, 90 to 95 days; Parrots sit 40 days; Swans, 42 days; Goose, 30 days; Ducks, 30 days; Pea Hens, 28 days; Turkeys, 28 days; Hens, 21 days; Pigeons, 14 days; Canaries, 14 days.

The periods of gestation are subject to considerable variation, espe-cially in domestic animals, and various conditions modify the period, of which the above are only the averages.

Fecundity Of Fish

A codfish has been found to produce 3,086,760 eggs; a flounder, weighing 24 ounces to produce 1,357,403 eggs; Herring, weighing from 4 to 6 ounces to produce from 21,285 to 36,960 eggs; Ling to produce 19,248,652 eggs; Lobsters, weighing from 14 to 36 ounces to produce 21,699; a mackerel, weighing 20 ounces to produce 454,061 eggs; a prawn, to produce 8,800 eggs; a shrimp to produce 2,800 to 6,800 eggs; Soles, weighing 4 1/2 ounces to produce 100,362.

Fecundity Of Birds

Eagle, lay at a sitting 2 to 3 eggs; Falcon lay from 2 to 4 eggs; Fowl, domestic, lay from 6 to 20 eggs; Hawk, from 2 to 4 eggs; Owl, from 2 to 6 eggs; Partridge, from 14 to 20 eggs; Pheasant, from 10 to 20 eggs; Wren, from 10 to 16 eggs; Sparrow, from 4 to 6 eggs; Sparrow Hawk, from 2 to 5 eggs; Stork, from 2 to 3 eggs; Swallow, from 5 to 6 eggs.