422 
DR. YELLOLY ON THE TENDENCY 
the town, which is at the rate of 1.8 per annum, or one for every 21,000 inha- 
bitants. 
In the Infirmary of Edinburgh, 41 cases have occurred in the last 10 
years ; but I have not been able to procure, separately, the numbers which 
were derived from the city and the country respectively. Taking-, however, 
the proportions as similar to what is found to be the case in the Glasgow 
Hospital (which is probably not far from the truth), there would be 24 of that 
number belonging to the city of Edinburgh, including Leith, and containing a 
population of 138,000, which would be at the rate of 2.4 per annum, or one 
case for every 57,000 inhabitants. 
In the southern and south-Avest parts of Scotland, as well as in the northern, 
the disease is exceedingly rare ; for Dr. Craigie of Edinburgh informs me, that 
it is hardly knoAvn in the Dumfries Hospital, which, as being the only esta- 
blishment of this kind south of Edinburgh and Glasgow, takes in a very large 
district in that part of the kingdom ; and Sir George Ballingall, the Regius 
Professor of Military Surgery in the University of Edinburgh, states to me, on 
the most respectable authority, that in Kelso and its neighbouring district, 
calculous complaints scarcely ever occur. 
The county of Northumberland, and that part of the county of Durham 
which is contiguous to the Tweed, a good deal resemble, in the unfrequency 
of calculous diseases, the adjoining districts of Scotland ; for by a list which 
Avas obligingly transmitted to me by Dr. Headlam of Newcastle, it appears, 
that 95 cases of stone operation occurred in the Newcastle Infirmary during 
the last 30 years, Avhieh is at the rate of 3.6 per annum. Of this number, 
64 belonged to the above district, including Newcastle, with the addition of 
Gateshead, which lies on the opposite bank of the Tyne, in the county of Dur- 
ham ; and these afforded 2.13 cases per annum, which, as the population Avas 
*213,000, gave one case for every 100,000 inhabitants. But if the country 
district be taken Avithout NeAvcastle or Gateshead, there will then be 29 cases 
in 30 years for a population of 166,000, and one case for every 172,000 
inhabitants. 
As very little has been hitherto known concerning the proneness to calculous 
diseases in Ireland, though it is generally believed that such complaints are 
unfrequent, I have lately instituted inquiries on the subject, at the various 
