or THE WIND AT MANCHESTER. 103 



are nearly equal; the N.W. is at its minimum amount 

 this quarter. 



When the winds are referred to the four principal 

 points only, we find the great prevalence of the S. wind in 

 winter very marked : this wind blows upon more days 

 in the winter quarter than any of the remaining winds re- 

 ferred to each separate quarter, with one exception, viz. the 

 W. wind, which slightly exceeds it in the summer quarter. 



The E. winds of spring become also very prominent 

 when referred to the four cardinal points only, and greatly 

 exceed the amounts in the other three seasons. With the 

 summer comes the great excess of W. winds, and dimi- 

 nution of E. winds. Autumn brings an increase of N. and 

 E. winds, and a falling off of W. and S. winds. 



The distribution of the winds during the year is of very 

 great importance, especially as bearing upon the question 

 of the public health. Examination of the returns of the 

 Registrar- General shows very distinctly the very large in- 

 crease which takes place in deaths from Phthisis during 

 that period of the year in which the E . wind prevails. When 

 the deaths from Phthisis, on an average of ten years for 

 London, are laid down in a curve, the maximum amounts 

 of mortality from this disease occur in the spring — ^pre- 

 cisely the period in which easterly winds so greatly 

 prevail. 



