Frank himself was obliged, in the interests of the school, to moderate the zeal of the naturalists, and to point out that cricket must not be given up, as, if so large a number withdrew themselves from the game, the school would suffer disaster in its various engagements with other schools in the neighborhood.

Consequently the rule was made that members of the club were bound to be in the cricket field on at least three days in the week, including one half holiday, while they were free to ramble in the country on other days.
This wise regulation prevented the "naturalists" from becoming unpopular in the school, which would assuredly have been the case had they entirely absented themselves from cricket.
One Saturday afternoon Frank started with a smaller boy, who was one of his most devoted followers, for a long country walk.

Frank carried his blowgun, and a butterfly net, Charlie Goodall a net of about a foot in depth, made of canvas, mounted on a stout brass rim, and strong stick, for the capture of water beetles.

Their pockets bulged with bottles and tin boxes for the carriage of their captured prey.
They had passed through Eastry, a village four miles from Deal, when Frank exclaimed, "There is a green hairstreak.

The first I've seen this year.