Corn.— Barley and oats are sown.
Liverworts.—Spore-cases of Pellia ([p. 200]) become visible.
ANIMAL LIFE.
General.—As in December.
Mammals.—Bats reappear.
Birds.—Thrushes and blackbirds pair and begin to build; study differences in song (pp. [304] and [308]). Rooks repair and build nests ([p. 318]).
Frogs. ([p. 332]) reappear.
Insects.—Pupae of cabbage-white butterflies and other Lepidoptera may be found.