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vantages, some peculiarly its own, others shared in common with the 

 circular variety of doubly -reflecting instruments ; and that, in a 

 word, they were all, though convenient enough for day observations 

 of the sun and moon, extremely inconvenient for, if not altogether 

 incapable of, observations of the stars at night. 



The author then pointed out, in some instruments exhibited, their 

 various imperfections, explaining the cause, and giving the mode of 

 removing them ; and finally produced a new description of circle, in 

 which he had had all the above-mentioned imperfections corrected. 



The execution of the idea had been entrusted to Mr John Adie, 

 and had been performed so efficiently, that the author considered that 

 his best thanks were due to Mr Adie, who had thus most materially 

 assisted the carrying out of the original ideas. 



2. Notice of an Antique Marble Bust (with Photographs). 

 By Andrew Coventry, Esq. 



Mr Coventry read a short notice of an antique marble bust which 

 he had had the good fortune to purchase from a gentleman in West- 

 moreland, last autumn, and had reason to believe had been brought 

 from Italy. 



The bust, of which some very fine photographs were exhibited 

 (executed by Mr Tunny of Newington, and Captain Scott, R.N.), 

 Mr Coventry considered to be a portrait, and a work of high Greek 

 art. On various grounds, but chiefly from its great resemblance to 

 the busts of the young Augustus : — from the hair beinc treated in the 

 method in use in his day and soon after abandoned ; and from the 

 accordance of the features with the known history and character of 

 Octavia, the sister of Augustus, Mr Coventry was disposed at first 

 to think it the bust of that celebrated personage. But he deferred 

 to an opinion which he had received by that day's post from Mr 

 Burgon of the British Museum, that it was the bust of Antonia 

 Augusta, Octavia's second daughter by Marc Antony, in honour of 

 whom coins had been struck by her son Claudius. Mr Burgon's 

 opinion rested on the authority of those coins, which were inscribed 

 with h# name and bore the strongest resemblance to the photo- 

 graphs Mr Coventry had forwarded to him from his bust. 



