TENDENCY TO CALCULOUS DISEASES. 



Up to the age of 14, the deaths are only 1 in 14^ ; and above that age, 1 in 

 5^. Between 14 and 40, the mortality is 1 in 10^ ; but after that period of life, 

 it is augmented to the formidable extent of 1 in 3f. •'!.?!■:; .nof-mv! 



The number of female cases, in the whole, has been 3 1 ; the proportion, 1 in 

 20 ; and the deaths 1 in 15^. But from the improved practice by dilatation, all 

 risk of life, in the abstraction of calculi from females, seems to be taken away. 

 I have mentioned, in the Medico-Chirurgical Transactions, the removal from a 

 female of a calculus of nearly Bjoz. troy, in weight, by spontaneous dilatation*; 

 and some examples are given in the Philosophical Transactions, by Dr. Moly- 

 NEUx, Dr. Heberden, and others, of a similar kind : but it was not till of late 

 years, that dilatation was employed to supersede the usual operation of litho- 

 tomy in women. 



The following Tables will exhibit, at one view, the number of operations of 

 lithotomy at the Norfolk and Norwich Hospital, with the mortality, at different 

 periods of life. 



* Vol. vi. p. 57i.-> iii'itmH 



