178 Asutosh Mukhopadhyay — On a curve of Aberrancy. [June, 



The following gentlemen have expressed a wish to withdraw from 

 the Society : — 



J. Wilson, Esq., C. S. 

 R. Whittal, Esq. 



The Secretary reported the death of the following member :— 

 Hon. Rao Saheb Visvanath Narayana Mandlik, 0. S. I. 



The Secretary announced that R. D. Mehta, Esq. had compounded 

 his subscription as a Resident member by the payment in a single sum 

 of Rs. 390. 



Mr. Wood-Mason exhibited 4 Cannon balls (?) and 1 Musket ball 

 found six feet below the surface of the ground at the Katholya gate of 

 Rohtas fortress by Mr. H. B. W. Garrick, Archaeological Survey of 

 Bengal. 



Mr. E. C. Cotes exhibited specimens of the silkworm fly. 



The following papers were read — 



1. Catalogue of the Insecta, Order Rhynchota. Sub-order Heruip- 

 tera Heteroptera. Family Capsidse. — By E. T. Atkinson, Esq., C. S. 



2. On a curve of Aberrancy. — By Asutosh Mukhopadhyay, M. A., 

 F. R. A. S., F. R. S. E. 



(Abstract.) 



The object of this note is to prove that the aberrancy curve (which 

 is the locus of the centre of the conic of closest contact) of a plane 

 cubic of Newton's fourth class is another plane cubic of the same class, 

 the invariants of which are proportional to the invariants of the original 

 cubic ; it is also proved that the two cubics have only one common point 

 of intersection, which is the point of inflexion for both. 



The papers will be printed in the Journal, Part II. 



Library. 



The following additions have been made to the Library since the 

 meeting held in May last. 



TRANSACTIONS, PROCEEDINGS AND JOURNALS, 



presented by the respective Societies and Editors. 

 Batavia. Bataviaasch Genootschap van Kunsten en Wetenschappen,— 

 Notulen, Deel XXVI, Aflevering 4. 



