■VOL. XLIX.] 



PHILOSOPHICAL TRANSACTIONS. 



601 



joining the bills of both places together. And we may also nearly determine the 

 number of infants born here, which hitherto has not been considered. 



Now, from the births, which are found = I9561, and the numbers of the 

 dead in the different periods known by our bills, it will be easy to form a table 

 of the decrements of life ; because the dead in the intermediate years may be 

 found by proportion from the Breslau table. And accordingly Dr. B. computed 

 the following, which is constructed from the London and Breslau bills together; 

 which he thinks is a surer method of computing for us at London, than from 

 either of them alone. The first part to the 21st year, is done from our bills, 

 and the other part from the Breslau ; but it is formed in such a manner, that it 

 goes on as if from the bills of one place only. For, after the age of 20, it is 

 continued by proportion, by making the dead at London in the decennial periods, 

 to have the same ratio to each other, as the dead at Breslau. It supposes lOOO 

 persons bom in one year, and shows the annual decrease of them by death till 

 87 years of age, which may be considered as the utmost period of life. The in- 

 termediate numbers, marked d, show the dead in each year. The use of this 

 table is well known to all who can compute the value of annuities for lives. 



XXIX. Of a Sheep, shoived alive to the Royal Society, in November I754, 

 having a Monstrous Horn growing from his Throat ; the stuffed Skin of which, 

 with the Horn in situ, was placed in the Museum of the Society. By James 

 Parsons, M.D., F. R. S. p. 183. 

 This animal was bred in Devonshire, with the preternatural horn appearing at 



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