MANCHESTER, FROM 1786 To 1857 INCLUSIVE. 165 
d 
From the foregoing tables it will be seen that, includ- 
ing Mr. Walker’s returns, the average fall of rain during 
the 72 years is 36°3988; and, excluding his returns, the 
average for the remaining 64 years is 35°5620. Dr. Dal- 
ton’s average of 47 years is 35°523, showing the small dif- 
ference of ‘039 between the two latter averages. I think 
we may, therefore, assume that Dr. Dalton was right in 
supposing that Mr. Walker’s returns were in excess of the 
reality ; and, for the purpose of arriving at a correct aver- 
age, it will be safer to omit them and adopt 35°5620 as 
the average fall of rain for Manchester. 
As the situation of the rain-gauge employed, and the 
influence of surrounding objects on it will produce different 
results, the following table has been prepared to show the 
mean monthly and yearly fall of rain, as registered by each 
observer, of the whole period and of the 64 years, the 
average obtained during the latter period being that which 
I recommend being adopted as nearest the truth. 
Walker. Dalton. Casartelli. Curtis. Total 
8 years. 47 years. 14 years. 3 years. 72 years. St years. 
1786 to 1798 | 1784'to 1840 | 1841'to 1854 | 1855 to 1857 | 1786 to 1857 | 1794 to 1857 
inclusive. | inclusive. | inclusive. | inclusive. | inclusive. inclusive. 
Inches. Inches, Inches, Inches, Inches. Inches, 
January .| 2°4685 2°257 33390 2-150 274890 2:4915 
February 2°7499 | 2°443 2-437 1946 2°4556 2°4190 
271145 2 308 2-261 1-526 272427 2°2588 
2°3019 27114 1697 2/123 2°0536 2°0225 
3°5103 2°4.46 27134 2°376 2°5008 23746 
3°3000 2°691 3319 3°106 2°8985 2-8483 
455832 3°706 3°793 3°663 3°8187 3°7231 
47499 3°463 3°767 4356 3°7025 3°5715 
452144, 3192 3°103 2356 3°2552 3'1353 
4°5104 3°754 4: 262, 3°2238 39150 3°8404 
November] 3°3019 3°712 3°416 2'020 3°5386 3°5682 
December| 5°2873 3°437 37148 27012 3°5286 3°3088 
Total... 43°0922 | 35°523 36672 _ 30°857 363988 | 35°5620 
First 5 
months 
164451 | 14259 | 15°183 | 13°227 | 146402 | 14°4147 
Second } 
G mos. 
26°6471 | 21:264 | 21-489 | 17°630 | 21°7586 | 21°1473 
The preceding table shows that, taking the average, 
April is the driest and October the wettest month in the 
VOL. XV. z 
