ON THE SEASONAL VARIATIONS OF TEMPEEATDRE. 



485 



excess amounting to 13°*6, and ranging from 0°'l to 3°'6. The maxima 

 of difiFerence were, as regards the Nith, in September and April — 

 September 5°'4, April 4°'3. But in the case of the Dee they occurred 

 in October 5°9, and January 6°"5. The minima occurred, for Nith, in 

 December, 0°'5 (water higher than air), and July l°'l (water lower) ; 

 for Dee, July 0°-9 (air higher than water), August 1°. 



The extreme range of temperature at Dumfries (hour of observation 

 being about noon) was : air, highest on June 23, 75°'6 ; lowest on Decem- 

 ber 13, 27°-7 ; range, 47°'9. Water, highest on June 22, G8° ; lowest on 

 January 5, 33°-l; range, 34°-9. 



CUEVE VII. 



-Little Eoss Lighthouse, Solway Firth. 



AiK Water 



10 a.m. 



The Stour, Canterbury. 



Colonel Horsley, R.E., has taken a great interest in the observations 

 on the Stour at Canterbury. His reports on the work done are followed 

 by the monthly means calculated from the weekly means which are shown 

 in Curve No. VIII. 



Holes on Temperature of Air and Water on the Stour at Canterbury during 

 1889, hy Colonel W. H. Hokslet, B.E., under tlie auspices of the East 

 Kent Natural History Society, December 188S-May 1889. 



With the view of giving effect to the intentions of the Committee, the 

 Committee of the East Kent Natural History Society appointed a sub- 

 committee to carry out the observations on river-temperature. They were 

 fortunate in securing the willing services of an Associate of their Society, 

 Mr. Henry Dean, of 35 St. Peter's Street, Canterbury, by whom the 

 observations now reported on were made. 



The observations commenced on December 13, 1888, and have been 

 continued day by day to the present time (May 15), a period of Ave months. 



The river in which the observations are taken is the western branch 

 of the Stour, which flows through Canterbury and empties itself into the 

 sea at Pegwell Bay, near Sandwich, about 15 miles distant. The depth 

 of water is about 2 feet in the ordinary state of the river, increasing to 

 3 feet or more when the river is in flood. The direction of the stream is 

 from south-west to north-east. The banks are low, and shaded with trees. 



In accordance with the directions received from the Secretary of the 

 Committee, the observations were taken at 9 a.m. regularly day by day, 

 always at the same place, and within five minutes walk from Mr. H. 



