Oct. 29th, 30th, and 31st.WONDERFULLY fine, with the full harvest moon, dazzling and silvery. I have haunted the river every night lately, where I could get a look at the bridge by moonlight. It is indeed a structure of perfection and beauty unsurpassable, and I never tire of it. The river at present is very low; I noticed to-day it had much more of a blue-clear look than usual. I hear the slight ripples, the air is fresh and cool, and the view, up or down, wonderfully clear, in the moonlight. I am out pretty late: it is so fascinating, dreamy. The cool night-air, all the influences, the silence, with those far-off eternal stars, do me good. I have been quite ill of late. And so, well-near the centre of our national demesne, these night views of the Mississippi.