14 C. PIAZZI SMYTH ON 



almost the whole period, — there was too evidently something, somewhere want- 

 ing- in that observer. 



Again in No. 9 the differences from morning to evening are better ex- 

 pressed, but the wet-bulb is too often higher than the dry-bulb, to be fully 

 credible. And in No. 11, the observer, by simply entering the depression as 

 always 1 degree, unless when he sometimes makes it just 2 degrees, shows that 

 he is not aware of either the refinement, the truth, or the power of this beau- 

 tiful method of arriving scientifically at the Hygrometric state of the air about 

 him. 



But of the remaining 21 stations, a notable majority does show a very 

 remarkable depression of the wet-bulb to have occurred on the 8th of April, 

 1882; and without anything similar to it on the other days, either before or 

 after. 



Thus North Esk Reservoir, height 1150 feet, had a wet-bulb depression that 

 night of 5° *8, in place of a 3° average. 



Wanlockhead, 1334 feet high, had a depression of 6 0, 8 in place of its 

 average 3° - 5. 



Moffat, 350 feet high, had 6°'9, in place of 2°5. 



Greenock, 233 feet high, had 12° 2, in place of 4° -5. 



Paisley, 88 feet high, had 5 o, 0, in place of 3°*5. And 



Glasgow, 54 feet high, had 5° - 0, in place of 2 D, 5. 

 While at other stations, the anomaly occurred earlier in the day, or at the 

 9 a.m., in place of the 9 p.m. observation : thus — 



Braemar, 1114 feet high, had 4° 5, in place of an average 3 o, 0. 



New Pitsligo, 495 feet high, had 2 0, 6, in place of 1 0, 2. 



Stobo Castle, 600 feet high, had 7°'0, in place of 3 o, 0. 



Stronvar, 428 feet high, had 4 o, 0, in place of 2° J 2. 



Dalkeith, 190 feet high, had 3° -5, in place of 2° 3. 



Callton Mor, 135 feet high, had 13°-0, in place of 4°0. 



Balloch Castle, 93 feet high, had 5°-3, in place of 2° -2. 



Eallabus, 71 feet high, had 8°'0, in place of 4°0. 



Aberdeen, 66 feet high, had 2° '9, in place of 2° 3. And 



Gordon Castle, 104 feet high, had 7°9, in place of 3°8. 

 Taken only so far, though very confirmatory on the whole, there are larger 

 anomalies among the stations, both as to quantity and time, than is desirable- 

 I therefore applied next to Mr W. H. M. Christie, Astronomer-Royal, at 

 Greenwich, for the hourly observations of the self-recording dry and wet bulb 

 thermometers there ; and made the same request to Mr Robert H. Scott, for 

 the returns from the Meteorological Council's Observatories of Glasgow and 

 Aberdeen. They kindly responded, and their communicated observations are 

 contained in Appendix III. 



