306 DE R. E. SCORESBY- JACKSON 



two months are derived as already described ; but for the arrangement and calcu- 

 lations in the several tables, and for the inferences therefrom, mentioned in the 

 text, I am alone responsible. The inquiry is led into the influence of weather 

 upon mortality from all causes, from all specified causes, from zymotic diseases, 

 from typhus, from scarlatina, from diarrhoea, from tubercular diseases, from 

 phthisis pulmonalis, from diseases of the respiratory organs, from bronchitis, and 

 from pneumonia, at all ages ; and from all causes at four different periods of 

 life — namely, under five years of age, between five and twenty, between twenty 

 and sixty, and from sixty upwards. 



In order to simplify the comparison of the meteorological with the mortality 

 tables, and to render the fluctuations of the death-rate more distinct, I have 

 reduced the number of deaths in every case to the ratio per ^ 00,000, living in the 

 eight larger towns at the time when the deaths were recorded, taking the esti- 

 mated population for each of the six years as the standard of reference. Whether 

 I have obtained a strictly correct estimate of the population of the eight towns 

 or not, I cannot positively say ; that given in the reports of the Registrar-General 

 required considerable correction after the taking of the census in 1861. In con- 

 sequence of this alteration, I had to recalculate my tables. In their present form 

 the tables are calculated upon the following basis : — 



y Population of the Deaths from all Causes in 



Eight Large Towns. the Eight Large Towns. 



1857, 843.902 23,361 



1858, 853^830 23,420 



1859, 863,761 22,345 



1860, 873,686 26,028 



1861, 883,748 23,130 



1862, 893,850 24,965 



Average, 868,796 Total, 143,249 



In the mortality tables, each of the months of thirty-one days is reduced to 

 the value of thirty days, and the death-rate of February of each year is raised to 

 the same value, so as to have uniformity over the whole seventy-two months. 



The red dots upon the map indicate the situations of the meteorological 

 stations ; the red lines, the positions of the eight large towns, namely, Glasgow, 

 Edinburgh, Aberdeen, Dundee, Perth, Greenock, Paisley, and Leith. 



The diagrams which I have constructed to illustrate the paper, are, I 

 venture to believe, not without considerable value. They present to the eye at 

 one glance, the whole scheme of the investigation, and will probably leave a more 

 vivid impression upon the minds of those who care to examine them than would 

 result from an unaided examination of the tables, or a perusal of the text. 



Of the three larger tables, the first (A) is arranged to represent a gradually 

 descending ratio of mortality, the several months of the six years being placed in 

 the order of the death-rate, — that in which the greatest number of deaths occurred 



