IV PREFACE. 



observer, and Mr Alexander Hogg, an ingenious mechanic who had been engaged 

 in the construction of the Observatory (which was performed chiefly under his 

 superintendence), and who had been afterwards employed as an observer on Term 

 days, was in consequence appointed in the end of 1843. 



In 1844 and 1845, a series of observations of all the magnetical and meteoro- 

 logical instruments was made hourly except on Sundays. It was originally pro- 

 posed that this hourly series should extend through only two years ; in 1846, 

 therefore, the same system was adopted as in 1843. A more limited series of ob- 

 servations was made in the years 1847, 1848, and 1849. 



After 1845 the ordinary observations at Makerstoun were chiefly made by 

 Messrs Welsh and Hogg. The latter continued the observations in 1849, and 

 thereafter, in accordance with instructions left by Mr Broun for his use, who also 

 examined the Observatory in 1851. 



In the autumn of 1849 Messrs Broun and Welsh left Makerstoun for Edin- 

 burgh, where the former continued the preparation of the last volume of the Maker- 

 stoun Results* for the press, Mr Welsh aiding in the reductions and preparations 

 of tables ; and with this work they were occupied till the spring of 1850. 



In that volume the observations were fully discussed until the beginning of 

 1847, while certain results were obtained extending to November 1849. 



It is the observations from 1847 to 1855 that are chiefly discussed in this 

 Appendix ; while, at the same time, certain general conclusions are drawn from 

 the whole series of observations. 



From 1849 Mr Hogg was almost entirely responsible for the accuracy of the 

 observations — a duty for which his experience and fidelity rendered him well 

 qualified. Mr Broun and Mr Welsh occasionally inspected the instruments. 

 The former left England for India in November 1851. Mr Welsh had already, in 

 1850, been appointed to the charge of the Kew Observatory, and continued, so far 

 as his other duties permitted, to take an interest in the Makerstoun Observations, 

 and aided the Editor of this Appendix with his valuable advice down to the period 

 of his premature decease in May 1859. 



* Edin. Trans., Vol. XIX. " . 



