486 KEPOBT— 1891. 



Dean's house. Remarks on ' State of River and Weather ' are entered 

 in the observing book at the same time. The following are some of the 

 results noticed. 



In December, as a general rule, the temperature of the vrater is higher 

 than that of the air, but there are exceptions, e.g., on December 19 the 

 temperature of air and water was nearly the same, viz., 43°, the wind at 

 the time was "W.S.W., and the weather clear and fine. It was the same 

 on December 24. The greatest difference in the temperature of air and 

 water was on the 25th, when that of the air was 35°, and of the water 

 44°*3. On January 1, 1889, the difference is more remarkable, viz., air 

 30°"6, water 40°, and the same was the case on the day following, viz., air 

 29°, water 38°'5, with the wind N.E. and weather fine. 



A sudden rise of temperature occurred on January 8, when that of the 

 air was 39°'8, and of the water 38°'2, somewhat colder than the air, the 

 wind S. and the weather fine. The same was the case the day following, 

 viz., air 45°, water 41°-5. 



As a rule the temperature of the water does not increase so rapidly as 

 that of the air. On ]\Iay 5, for instance, the air was 69° and the water 

 57°-2, the same on May 9, viz., air 62°, water 57°. 



In February, with snow on the ground, the temperature of the air 

 varied from 25° 8 to 34°-8, and that of the water from 34°-6 to 39°-5, the 

 wind at the time being E. to N.E. 



Speaking generally, it is observed that with the wind S. or S.W., and 

 rain falling, the temperature of air and water differs by only one or 

 two degrees. 



Notes on Temperatures of Air and Water at Canterbury, from May 1889 to 

 Lecember 1889. By Colonel W. H. Horslet, B.E. 



The previous set o'f notes refers to observations taken up to May 15, 

 1889. In the same month the temperature of the air rose considerably, 

 the highest being on the 29th, when it was G9°'8, while that of water was 

 only 60°, the wind being S.W. and weather fine. Towards the end of 

 May the temperature of air and water once more approximated. 



On June 2 there was a sudden and considerable rise in the air-tem- 

 pei'ature, but only a moderate rise in that of the water, the difference 

 between them being 14°, with the wind as above ; this again showing 

 that the water-temperature rises slower than that of the air. 



On June 10, with a N.N.E. gale blowing, the temperatux-e of the air 

 fell to 53°, while that of the water was 55°'2. As a general rule through- 

 out this month the water-temperature was below that of the air. The 

 last-mentioned is in fact the only instance to the contrary. 



On June 20 the thermometer in use was accidentally broken, and 

 considerable delay ensued in procuring a new one of similar construction. 

 An ordinary instrument was, in the interval, supplied to Mr. Dean, and 

 with it the observations were taken and recorded until September 19. 

 The readings of this instrument, and that supplied subsequently from 

 Edinburgh, were found to agree very fairly, and the results of the obser- 

 vations taken during the interval show, as might have been expected, 

 that the air-temperature is above that of water throughout the summer 

 months, June, July, and August. There was only one exception, viz., on 

 August 23, when the air was one degree colder than the water, with the 

 wind in the N.W. and weather fine. A similar exception to the general 

 rule occurred on September 16, the air being 53° and the water 55°, with 



