i68 



Observations of Temperature. 



effects appear so rapidly, that there is a marked difference 

 in the behaviour of the Oldham Road Observatory on 

 Sundays and other days. I was struck by the fact that on 

 only 5 occasions did the Oldham Road Observatory record 

 lower temperatures than the Whitworth Park, and all five 

 cases happened during the night from Saturday to Sunday, 

 or from Sunday to Monday. I have arranged Mr. Wilson's 

 record according to the days of the week, and the result is 

 shewn in the following table. 



No very certain conclusions can be drawn from the 

 record of a few weeks only, but it is certainly suggestive 

 that while the mean difference on Saturday and Sunday 

 nights is i°7 only, the mean difference during the rest of 

 the week is double that number, or 3°"4. 



In future observations attention will be directed to these 

 differences as depending on the general state of the atmo- 

 sphere. In conclusion, I should like to state that I shall be 

 glad to receive the names of gentlemen residing in different 

 parts of Manchester who would volunteer to take regular 

 records, especially of sunshine, the instruments being sup- 

 plied to them. 



