METEOROLOGICAL OBSERVATIONS AT CARNWATH. 16'J 



over three months from August to October. The result is a 

 genei'al, and in many cases a minute correspondence with the 

 conclusions previously obtained. 



The following are the more important of these conclusions : 

 First, and most important of all, the mean temperature inside the 

 wood was greater than it was oiitside during the whole of the year, 

 except the autumn months, the mean annual temperature being 

 45*5° inside, and 45 -3° outside the wood; second, the temperature 

 at nine p.m. was the same both inside and outside the wood ; third, 

 in the spring and early summer, the air inside the wood was both 

 warmer and moister than outside • fourth, during the autumn the 

 excess of moisture inside the wood is very greatly increased, and 

 this result has been confirmed in a remarkable degree by the 

 observations made during September last, when the weather was 

 unusually damp. 



Your Committee are of opinion that something shoidd be done 

 next year to have a more complete discussion of the observations 

 made than had yet been effected. For instance, the daily observa- 

 tions ought to be separated as regarded strength of wind, the 

 amount of cloud, the effect of sunshine, of cold, of frost, long con- 

 tinued cold, and the effect of continuous rain on the quality of the 

 air, both inside and outside the wood, and the converse, the effect 

 of continuous drought. Until this is done, the full value of the 

 observations will not be realised. 



It is proposed, about the close of the year, to remove the box 

 with the thermometer from the station at Gallowhill, outside the 

 wood, to a new position inside the wood, where the thermometers 

 will be, as before, 4 feet above the ground, completely shaded 

 by the trees, but otherwise in close proximity to the Winterlaw 

 station inside the wood, at which the box is fully open to the 

 influence of solar and terrestrial radiation. It is further proposed 

 to add at each of these stations a set of underground thermometers, 

 of depths of 3, 12, and 22 inches, which will be observed daily 

 with the other instruments. It would have been preferable to 

 have retained the instruments at Gallowhill, and procured a third 

 set of instruments for the new station under the trees ; but the 

 funds placed at the disposal of your Committee will not admit of 

 this additional expenditure. 



The chief point in this large and important inquiry which these 

 arrangements have been designed to elucidate is this : Whether 

 there be not a very considerable difference in the mean annual 



