By Mr. Greg or Drummond. 



57 



and that of the spring water used 46°. In twenty- four hours after 

 the temperature of the border was reduced to 52°, or had lost 12 . 

 At the same time the temperature of the soil being 64° as above, 

 and heat of the pond water 67° the soil at the close of twenty-four 

 hours was 66°, or, instead of losing 12°, had gained 2°. 



June 20th, the second watering was given. The temperature of 

 the border at the depth of eighteen inches was now 74°, and that of 

 the spring water 52°. In twenty-four hours the border was reduced 

 to 58°, or had lost 16°. At the station where the pond water was 

 used the temperature of the border at the above-mentioned depth 

 was 77°, and that of the water 82 \ In twenty-four hours the tem- 

 perature of the border was 80°, or had gained 3°. 



The third and last watering was performed on the 28th of July. 

 The temperature of the border at eighteen inches below the sur- 

 face was 72°, and that of the spring water 57°. In twenty-four 

 hours the border was reduced to 61°, or had lost 11° of temperature. 

 At the pond water station the border, at the depth of eighteen 

 inches was 78°, and the water itself 74°. In twenty-four hours the 

 temperature of the border was still 78°, or had suffered no change 

 of temperature from the watering it had undergone. 



It is very clear from these facts that whilst spring water greatly 

 cooled the soil, that from the pond exerted no such operation, but 

 on the contrary often raised its temperature. 



In proceeding to describe the effects on vegetation produced by 

 these different kinds of water, Mr. D. observes, that on the 10th of 

 May, when the border was first watered, there was no perceptible 

 difference in the appearance of the four trees : they had all excel- 

 lent crops of fruit. About the first of August, however, the con- 

 trast was very striking. No one would then have supposed that the 

 four trees were of the same variety. The fruit of the two trees, 

 which had been supplied with the pond water, was much larger, 

 of a higher colour, and finer quality, than the fruit of the other 



