I hear that there has been a great fire in the woods this afternoon near the factory. Some say a thousand acres have been burned over. This is the dangerous time, - between the drying of the earth, or say when dust begins to fly, and the general leafing of the trees, when it is shaded again. These fires are a perfectly regular phenomenon of this season. Many refer to them this thick haze, but, though in the evening I smell the smoke (no doubt) of the Concord fire, I think that the haze generally is owing to the warm southwest wind having its vapor condensed by our cooler air. An engine sent from town and a crowd of boys; and I hear that one man had to swim across a pond to escape being burnt.