Although it is the 20th of September, the autumnal migration of birds, as seen in this neighborhood, is still very light. Robins are scattered throughout the woods in loose flocks--a state of things not to be witnessed in summer or winter; the birds rising singly from the ground as the walker disturbs them, sometimes all silent, at other times all cackling noisily. Chickadees, too, are in flocks, cheerful companies, good to meet in any weather; behaving just as they will continue to do until the nesting season again breaks the happy assembly up into happier pairs. My wood pewee--a particular bird in a grove near by--whistled pretty constantly till the 17th, and a warbling vireo was still true to his name on the 19th. I have heard no yellow-throated vireos since the 6th, and conclude that they must have taken their departure. May joy go with them. This morning, for the first time in several weeks, a pine warbler was trilling. Song sparrows have grown numerous within a few days, but are almost entirely silent. One fellow sang his regular song--not his confused autumnal warble--on the 19th. I had not heard it before since the month opened. No blackpoll warblers showed themselves with me till the 18th, though I had word of their presence elsewhere a few days earlier. On that day I saw three; yesterday and to-day have shown but one bird each. The movement is barely begun. I should like to know how common it is for blackpolls to sing on their southward migration. Eleven years ago, in September, 1889, they came very early,--or I had the good fortune to see them very early,--and on the 4th and 5th of the month a few were “in full song,” so my notes record, “quite as long and full as in May.” I had never heard them sing before in autumn, nor have I ever had that pleasure since. Neither have I ever again seen them so early. Probably the two things--the song and the exceptional date--were somehow connected. At the time, I took the circumstance as an indication that the adult males migrate in advance of the great body of the species; and I fancied that, having detected them once thus early and thus musical, I should be likely to repeat the experience. If I am ever to do so, however, I must be about it. Eleven years is a large slice out of an adult man’s remaining allowance.