One of the Committee of the Linnæan Society was himself an eye-witness, and Colonel Perkins, of Boston, published in 1848 a communication which was a copy of a letter he had written in 1820, detailing his personal experience in confirmation of the Society's Report, as follows:--"In a few moments after my exclamation, I saw, on the opposite side of the harbour, at about two miles from where I had first seen, or thought I saw, the snake, the same object, moving with a rapid motion up the harbour, on the western shore. As he approached us, it was easy to see that his motion was not that of the common snake, either on the land or in the water, but evidently the vertical movement of the caterpillar. As nearly as I could judge, there was visible at a time about forty feet of his body. It was not, to be sure, a continuity of body, as the form from head to tail (except as the apparent bunches appeared as he moved through the water) was seen only at three or four feet asunder. It was very evident, however, that his length must be much greater than what appeared, as in his movement he left a considerable wake in his rear. I had a fine glass, and was within from one-third to half a mile of him. The head was flat in the water, and the animal was, as far as I could distinguish, of a chocolate colour. I was struck with an appearance in front of the head like a single horn, about nine inches to a foot in length, and of the form of a marline-spike. There were a great many people collected by this time, many of whom had before seen the same object, and the same appearance. From the time I first saw him until he passed by the place where I stood, and soon after disappeared, was not more than fifteen or twenty minutes. "Subsequent to the period of which I have been speaking, the snake was seen by several of the crews of our coasting vessels, and in some instances within a few yards. Captain Tappan, a person well known to me, saw him with his head above the water two or three feet, at times moving with great rapidity, and at others slowly. He also saw what explained the appearance, which I have described, of a horn on the front of the head. This was doubtless what was observed by Captain Tappan to be the tongue, thrown in an upright position from the mouth, and having the appearance which I have given to it. "One of the revenue cutters, whilst in the neighbourhood of Cape Ann, had an excellent view of him at a few yards' distance. He moved slowly; and upon the approach of the vessel, sank and was seen no more."