69 



Mr. Justice stated, that upon recently examining the object 

 glass of the telescope at the Friends' School in Cherry street, 

 he found it much impaired by an apparent oxidation of the 

 surface, which was, however, easily removed by wiping it 

 with sheep-skin: and he believed, that by early attention in 

 this way, many valuable glasses might be kept in order by a 

 timely removal of the arborescent substance on the surface. 



Further observations on the subject of the changes of the 

 surface of glass were made by Mr. M'Culloh, Dr. F. Bache, 

 Dr. Elwj'n, and Judge Kane. 



Mr. Richards gave an account of a singular lusus natiirse, 

 in the form of a calf having two heads, four distinct eyes, two 

 mouths, each capable of receiving sustenance, and with but two 

 ears. This monster was produced by a cow in New Jersey, 

 about 35 miles from this city. 



Mr. M'Culloh mentioned a series of experiments which he 

 has been conducting under the superintendence of Prof. A. D. 

 Bache for the U. S. Government, in reference to a proper col- 

 lection of the revenue on distilled spirits, of which the results 

 will shortly be presented to the Secretary of the Treasury. 



A letter from Lieut. J. M. Gilliss was read, enclosing a let- 

 ter from Dr. G. A. Jahn, of Leipsic, acknowledging the receipt 

 of notice of his election as a member of this Society; and a 

 communication in Latin from Dr. Jahn, which, on motion of 

 Judge Kane, was referred to a Committee, consisting of Prof. 

 S. Alexander, Mr. James, and Prof. Kendall. 



Pending nominations, Nos. 226, 227, and 228, were read. 



Judge Kane referred to the report and resolution presented 

 at the last meeting, in relation to the letter of the Superin- 

 tendent of the Coast Survey, and called the attention of the 

 Society to the resolution, slating that the views of the Society, 

 as therein expressed, seemed not to have been correctly appre- 

 hended at Washington, and suggesting that a further expres- 

 sion on the part of this Society might be expedient and pro- 

 per: he therefore offered the following resolution, which was 

 agreed to: — 



Resolved, That the Society do approve and adopt the deduction set 

 forth in the report made at the last meeting, by the Committee to 



