293 



The principal points discussed in this paper are noticed in an oral 

 communication made by Mr. Walker on the 21st of August. (See 

 Proceedings, No. 13, p. 261.) 



The Committee, consisting of Dr. Patterson, Prof. Bache, 

 and Mr. Walker, to whom was referred a communication from 

 Mr. Nulty to Mr. Lea, on a new property which he had found 

 in his Magic Cyclovolute, described in the seventh article of 

 the fifth volume of the Society's Transactions, reported that 

 they had learned from the author, that his communication was 

 not intended for the Transactions, and that he did not desire it 

 to take that destination; they therefore requested to be dis- 

 charged, which was ordered accordingly. 



The new property is as follows : — " The eight volutes which origi- 

 nate at the extremities of the principal diameters, AA', BB', are di- 

 vided by these diameters, so that every four numbers along each vo- 

 lute, both towards its origin and the centre of the interior circle, with 

 half the central number twelve, make 180." This property, Mr. 

 Nulty remarks, is analogous to the third, mentioned in his paper ; 

 distinguishes the particular set of numbers which he had selected 

 from other sets possessing the properties already noticed, and renders 

 his drawing more general, and the arrangement, there presented, 

 unique. 



A communication was read, entitled "Observations to deter- 

 mine the Magnetic Intensity at several Places in the United 

 States, with some additional Observations of the Magnetic Dip, 

 by Elias Loomis, Professor of Mathematics and Natural Phi- 

 losophy in Western Reserve College,'' which was referred to 

 a Committee. 



Professor Bache submitted to the Society a Chart, represent- 

 ing the extraordinary variations of the magnetic declination 

 during the term day, on the 29th of May last, prepared by W. 

 C. Bond, Esq., from the observations at the Magnetic Obser- 

 vatory at Cambridge. 



Dr. Horner read a paper on the dental system of the Masto- 

 don, which was referred to a Committee. 



Professor Bache read an extract of a letter from Lieut. Rid- 

 dell, Director of the Magnetic Observatory at Toronto, U. C, 



