OF ARTS AND SCIENCES. 



99 



nearly the whole of Vermont, all but the northern part of New Hamp- 

 shire, the southwestern part of Maine, and, in Massachusetts, the north- 

 eastern part of the counties of Franklin, Worcester, Norfolk, Plymouth, 

 and Barnstable, nearly the whole of Middlesex, and the whole of Suffolk 

 and Essex. A third line, drawn nearly equidistant between the two 

 others, from the southern part of Isle Royale in Lake Superior to 

 Ogdensburg, N, Y., thence over Middlebury, Vt., Hanover, Sanbornton, 

 Gilmanton, and Rochester, N. H., to the ocean at Cape Neddock in 

 York, Maine, will represent the path of the central eclipse ; as a 

 fourth, from Gibraltar Point, near Toronto, C. W., over Delhi and 

 Kingston, N. Y., Middletown, Conn., to Block Island, R. I., will that of 

 the line of eleven digits of obscuration on the north limb of the sun. 



" As sixty-three years have passed since the occurrence of the 

 last annular eclipse in New England, and as in the last forty-six years 

 of the present century only one more will take place, it is not doubted 

 that the one of May 26th will be viewed with interest by every spec- 

 tator ; but it is hoped that those observers, within the limits of the ring, 

 who may be provided with a good telescope, will give particular at- 

 tention to the singular appearances which so often have been noticed 

 at the second and third contacts, and which, in consequence of having 

 been minutely described by the late Mr. Bailly, are known by his name, 

 especially as there is some reason for the suspicion that these beads, 

 &c. may be seen or not, at the pleasure of the observer, according 

 as he employs a screen colored red or green. 



" In the eclipse of February 12, 1831, which was viewed by the 

 writer at the light-house on Monomoy Point, off Chatham, with a red 

 screen, these beads were, just before the formation of the ring, so very 

 conspicuous, that it was difficult to determine with precision when it 

 actually took place, whilst in that which was annular in Washington 

 in September, 1838, and that which was total near Savannah in No- 

 vember, 1834, these appearances could not be perceived by him, al- 

 though carefully looked for through a screen composed of two glasses, 

 one shaded light red, the other light green. 



" Indeed, it is particularly desirable that at some places there will 

 be two observers furnished with telescopes of nearly the same optical 

 power, but with screens colored green and red, who, after the second 

 contact, shall exchange their instruments for their observations on the 

 third, and shall note carefully the appearances and phenomena by 

 which each contact is attended. 



