Ixiv Introduction to the Makeestoun Observations, 1845 and 1846. 



rain-gauge. In pages 276 and 420, the temperature of water in two pump-wells 

 is given (see No. 93.) 



113. Extra Meteorological Observations, 1845 and 1846, pages 277-286 and 

 414-420. 



The first column of observations of the actinometer contains the Makerstoun 

 mean time of the first reading given in the third column, the reading in the fourth 

 column being made 60 seconds after ; the second column tells whether both of these 

 observations have been made with the actinometer in the sun or in the shade ; the 

 fifth column gives the change of reading in 60^ ; the sixth column contains the eficct 

 of the sun in changing the reading ; the seventh column contains the mean efi'ect 

 for a group ; and the eighth column contains the sun's altitude for the mean time 

 corresponding to the middle of each group. 



The readings of the barometer (corrected to 32° Fahr.) and of the dry and wet bulb 

 thermometers, together with meteorological remarks, are given in the foot-notes ; 

 other observations will be found in their proper places among the hourly observations. 



114. Additional meteorological notes are given after the observations of the 

 actinometer ; these consist of observations of shooting stars, thunder-storms, dates 

 of flowering of plants, times of the commencement of the morning-song of birds, &c. 



115. The Abstracts of Results^ will be found in the next volume forming Part 

 II. of Vol. XIX. of the Edinburgh Transactions. 



These Tables have appended or prefixed to them all requisite explanations, 

 together with remarks on the conclusions deduced. In all cases where any of the 

 ordinary hourly or daily observations had been omitted, the mean of the previous 

 and succeeding observations has been substituted in the summations. 



116. Curves of Term-Day Observations. 



The term-day observations, as corrected, pages 72-89, having been projected 

 and drawn with the greatest accuracy by Mr Welsh on lithographed curve paper, 

 they have been transferred by the anastatic process, in 12 Plates, given at the end 

 of the volume. 



