of the Climate of 'Naples upon the Periods of Vegetation. 49 



The last column gives the medium between the mean day 

 of White's observations at Selborne, that of Mark wick's at 

 Catsfield, and that of Marsham's at Stratton, which may there* 

 fore be taken with considerable accuracy for the regular date 

 of the appearance of the leaves of those trees in the southern 

 and eastern divisions of England, and, indeed, in England in 

 general, excepting, perhaps, its extreme northern parts.] 



On comparing the times of leafing of the same trees in 

 different years near Naples, it will easily be seen that this 

 period of vegetation varies according to the temperature which 

 has prevailed during the months of January, February, and 

 March. Thus, for example, in the year 1807, these three 

 months having continued very cold, the Elder opened its buds 

 at the beginning of February ; the Elm and the Filbert showed 

 their leaves at the end of the same month ; the Birch, the 

 Beech, the Oak, and the Lime were not seen in leaf till towards 

 the middle of April. On the contrary, in the year 1808, the 

 same months having been extremely mild, the frondescence 

 of the same trees took place successively fifteen days earlier. 

 Finally, in 1810, the thermometer in the beginning of March 

 having risen to 15° Reaumur (or nearly 66° Fahrenheit), in 

 the course of the same month the leaf-buds of those trees 

 which usually open in April, were observed to have fully ex- 

 panded themselves. 



[Now, in order to ascertain more correctly the true time, in 

 which the leafing of these trees is wont to occur about Naples, 

 let us take the mean dates of the different years given by 

 Tenore, and the results are as follows : 



Hence, by the above comparison of the true mean dates 

 with those in England, we find that near Naples the Elm is 

 earlier by about nine weeks, the Elder eight weeks, the Beech 

 six weeks, the Lime three weeks, the Oak nearly four weeks, 

 and the Birch only one week, than with us.] 



But, likewise at Naples, there are not wanting several sorts 

 of trees which are always very late in developing their leaf- 

 buds. I will mention Acer platanoides and A. Lobelli, which 

 having been transplanted from the high mountains, where 



Third Series. Vol. 5. No. 25. July 1834. H 



