216 



not had a single case in it for fifteen years. York City, 

 most wretchedly drained, had only. 



In 1841 20 cases. 



1840 33 „ 



1839 18 „ 



1838 11 „ 



82 



Average 20 out of 32,000 popu- 



lation ; much less than in the West-Riding towns. 



Probably a mean or combination of these opinions may 

 be the true one ; and it will be found that the predisposing 

 causes of fever are all agencies which debilitate the system, 

 or which are allied to, or increase, the effects of the con- 

 tagious virus, which is the materies morbi. Several of 

 these do co-exist in towns. Thus, hardships and innutri- 

 tion weaken the body. Malaria, we know, will cause one 

 kind of fever, and probably propagate typhus ; and a 

 deficient supply of pure air will render the disease more 

 fatal. Hence, in Halifax and Huddersfield, typhus is 

 more probably due to innutritions and a scanty supply of 

 food, and long hours of exhausting labour within doors, 

 than to any malarious influence. 



2. The next Geological advantage which Halifax and 

 Huddersfield have over Leeds and Sheffield is, that the 

 former have upon the spot excellent building stone, and 

 consequently the inhabitants have good houses, good streets, 

 and larger rooms in their houses. The buildings in Leeds 

 and Sheffield are chiefly of brick. The small quantity of 

 stone used in Sheffield is brought three miles, from Wadsley, 

 and the little in Leeds about two or three miles, from Bramley 

 Fall, and Woodhouse Moor and Roundhay. The houses in 

 Sheffield are notoriously small ; and in the old parts of the 

 town particularly, adjoining the River Sheaf, are to be seen 



