Haloes, tyc, as Harbingers of Falling Weather. 501 



extend the more useful vegetables, it is desirable that all ob- 

 servations on this subject should be recorded ; and, when 

 plants in cultivation are spoken of, they should be placed in 

 a different type. Italics naturally present themselves as 

 claiming this distinction. 



Respecting the interior of the large continents we know 

 but little, as they have been but imperfectly, or not at all, 

 examined. This enables us to place here some brief remarks 

 on the peculiarities of their floras, physical agents affecting 

 vegetation, &c. 



The very interesting subject of the different zones of vegetation 

 in mountain ranges is most conveniently detached from the 

 body of the map, and placed at the side. These must be 

 accurately drawn to an accompanying scale, and the mode 

 adopted for obtaining the elevation mentioned, whether by the 

 barometer, trigonometric survey, or any other means. 



Perpendicular lines should be added, to which is to be 

 attached the mean temperature, both as observed and cal- 

 culated. But, as this conveys very imperfect information, it 

 would be always advantageous to add the mean temperature 

 of the hottest and coldest months in the year. The humidity 

 of the atmosphere is also a very desirable object for enquiry. 



Plymouth, July, 1835. 



[In V. 587. are suggestions by Sir John Byerley, on de- 

 vising and adopting " conventional signs to express objects 

 in geology and physical geography."] 



Art. VI. Notices of Solar and Lunar Haloes, Parhelia, Para- 

 selene, and Meteors, as Harbingers of Jailing Weather, By W. 

 H. White, Esq. 



Having for several years paid considerable attention to 

 these beautiful and interesting phenomena, I send you a brief 

 notice of those that passed under my observation during the 

 last month (July, 1835). 



I have made choice of last month because the changes have 

 been so few, and the indications so unerring; at the same 

 time, I feel persuaded no general rules can be laid down for 

 judging of the future state of the weather at all periods, 

 especially in so variable a climate as ours ; yet I am convinced 

 if more attention were paid to the different undulations of 

 clouds, winds, haloes, meteors, &c, a tolerably correct estimate 

 might be formed of atmospheric changes, with as much cer- 



