Liverworts.—Spore-cases of Pellia ([p. 200]) open.
ANIMAL LIFE.
Birds.—Swallows build nests. Most birds are incubating eggs ([Chap. XVI.]).
Frogs and Toads.—Tadpoles may be found in ponds.
Insects.—Moths and butterflies are common. Cabbage-whites lay eggs. Caterpillars of tiger-moth ([p. 364]) and other Lepidoptera may be found. Aquatic insect-larvae in ponds.
JUNE.
PLANT LIFE.
General Work for Summer Months.—Study the forms and duties of leaves ([Chap. III.]); and the thickening of stems ([Chap. V.]). Examine, identify, and collect grasses ([Chap. VII.]) and summer flowers ([Chap. VI.]), and make observations upon cross-pollination of flowers by insects ([Chap. VI.]). Study the development and structure of fruits ([Chap. IX.]); and the life-history of ferns ([Chap. X.]). Compare and contrast mushrooms and toadstools ([Chap. XI.]).