424 
DR. YELLOLY ON THE TENDENCY 
been disappointed in not yet receiving returns*, it does not appear that more 
than 8 operations of lithotomy occur annually among the poor of Ireland, 
the whole population of which was considered, in 1821, to be about seven mil- 
lions'}-. But when we refer 5 of those cases to the city and county of Dublin, 
containing, together, a population of about 350,000, (which, from the documents 
with which I have been favoured, seems to be very near the truth,) it will be 
seen how minute the proportion of calculous cases must be in the remaining 
population of Ireland, when not more than 3 operations of lithotomy occur, 
annually, among the poor of a population of between six and seven millions. 
I have mentioned in my former paper, a suspicion, from some facts there 
stated by me, that the principal occurrence of calculous diseases is in towns. 
This idea is strengthened by a consideration of the lists of stone cases, for 
which I have been indebted to Dr. IIeadlam of Newcastle, and Mr. Eddison of 
Nottingham. In the town of Newcastle and Gateshead, calculous cases have 
occurred, within the last 30 years, in the proportion of about one for every 40,000 
inhabitants ; while in the county of Northumberland, independently, together 
with that part of the county of Durham which borders on the Tweed, the pro- 
portion, (as I have already remarked,) has only been one for 172,000 inhabitants. 
— In the town of Nottingham, the proportion, in 48 years, has been at the rate 
of one for every 67,000 inhabitants ; while in the county of Nottingham only, it 
has been one for every 146,000 inhabitants. 
In the town of Dundee, the calculous operations have occurred in the pro- 
portion of one to 41,000 inhabitants ; yet in the county of Forfar, in which Dun- 
dee is situated, the proportion has been one to 82,000. 
In Glasgow, the proportion has been, in the last 1 5 years, about one in 71,000 ; 
in Paisley, in 10 years, one in 21,000 ; and in Edinburgh, in a similar time, one in 
57,000 ; while there is every reason for supposing (though I cannot speak from 
direct evidence upon the subject) that the stone cases afforded to any of those 
establishments, by country population, is exceedingly small. It is to be re- 
marked, however, that the proportional numbers furnished by the town and 
country population of Aberdeenshire, during a period of 70 years, are nearly 
* These are Cavan, Meath, Westmeath, and Wexford. 
-f Statistical Illustrations, 3rd edition, 1827. 
