Sept. 19. [...] It is to me a very agreeable reminder of cooler weather. Hear a chewink's chewink. But how ineffectual is the note of a bird now! We hear it as if we heard it not, and forget it immediately. In spring it makes its due impression, and for a long time will not have done echoing, as it were, through our minds. It is even as if the atmosphere were in an unfavorable condition for this kind of music. Every musician knows how much depends on this.