Sentence out of letter from May (who is staying with Isabel just now at Cassel), dated 15th June, 1877:—

"I am reading the Ethics with a nice Irish girl who is staying here, and she's just as puzzled as I've always been about the fire-flies, and we both want to know so much.—Please be a very nice old Lecturer, and tell us, won't you?"

Well, May, you never were a vain girl; so could scarcely guess that I meant them for the light, unpursued vanities, which yet blind us, confused among the stars. One evening, as I came late into Siena, the fire-flies were flying high on a stormy sirocco wind,—the stars themselves no brighter, and all their host seeming, at moments, to fade as the insects faded.