Brigham.] 896 [April 7, 



four to six inches in diameter, and nearly as high; diameter of cells 

 mostly .05 or .06 ; distance between them commonly .05 to .08. 



Pearl Islands, at extreme low water of spi'ing tides; F. H. Bradley. 



More detailed descriptions of some of the preceding species will 

 soon be published, with figures, in the Transactions of the Connecti- 

 cut Academy, New Haven, Conn. 



Mr. W. T. Brigham presented a jDapcr upon Volcanic Man- 

 ifestations in New England. 



At various periods of our history earthquakes have convulsed New 

 England and the adjacent parts of Canada, and several mountains 

 have been reported of volcanic origin; indeed, within historic times 

 one has been said to emit smoke and ashes. Dykes of trap are com- 

 mon in Vermont and Massachusetts, and seem to point out definite 

 lines of volcanic dislocation. The discussion of these matters, both 

 from historical and geological standpoints was attempted in this 

 paper. 



The following commnnicaticn was " read from Dr. P. R. 

 Hoy, of Racine, Wisconsin, concerning the nidification of 

 Cooper's Hawk : — 



In May last, I had the rare fortune to find not less than four nests 

 of the Cooper's Hawk. As the evidence thus obtained was highly 

 interesting, to me at least, I will make full extracts from notes taken 

 at the time. 



May 4th, 1868. This morning I found the nest of a Coopei-'s Hawk 

 situated in the fork of a large sugar maple, nearly sixty i'oet from 

 ground; the bird was on the nest. I passed that way in the after- 

 noon, and found the hawk on still; next day I visited the locality with 

 the same result. May 7th, sent a cUmber to procure the eggs; I ob- 

 tained but three, two of whidh were fresh, the remaining one slightly 

 bloodshot. May 8th, C. Jackson found a nest on a pin-oak, (Q. pa- 

 lustris) thirty feet from ground, the hawk on the nest. May 9th, I 

 climbed the tree, found the bird on, and obtained four eggs, two of 

 which were fresh, the remaining two bloodshot. May 10th, nest found 

 by S. Ackalum, situated on a small pin-oak, fifteen feet high, the bird 

 on the nest. Next day I climbed the tree, found the hawk on, and 

 obtained two eggs, both of which were fresh. May 24th, a nest was 

 found by C. Ozahu, situated on a small sugar maple, twenty-five feet 



