of the Climate of Naples upon the Periods of Vegetation. 47 



tioned, Linnaeus relates some observations concerning the 

 frondescence of trees in the vicinity of Upsal, in which he there 

 says that the Elder unfolds its buds in the first days of 

 March ; the Indian Chestnut, the Pear, the Spindle Tree, open 

 in the beginning of April; the Elm, the Cherry Tree, the 

 Filbert, in the middle of March ; the Birch, the Beech, the 

 Lime, and the Oak, in the first days of May. 



About Naples, the Elder developes its leaves in the first 

 15 days of January; the Elm and the Filbert open their buds 

 in the beginning of February ; the Spindle Tree, and the 

 Indian Chestnut in the first week in March ; the Birch, the 

 Beech, the Lime, about the 15th of the same month; the 

 Hazel and the Oak in the beginning of April. 



In general, we may therefore assert, that in the environs of 

 Naples the expansion of the leaf is earlier by one month and 

 a half than that of the same plants in the North of Europe. 



Being desirous to compare this time of vegetation of the 

 trees near Naples with that of the trees which grow in the 

 neighbourhood of Paris, I have consulted the observations 

 made by Dr. Chavassieux d'Audibert in his Exposition des 

 Temperatures, and I have found that this period of vegetation 

 gives, between the two countries, the difference of one month. 



In fact, M. d'Audibert fixes the middle of February for 

 the appearance of the leaves of the Elder; March, for that of 

 the Osier, of the Elm, of the Almond, and of the Chestnut; 

 April, for that of the Birch, of the Hazel, and of the Bramble; 

 May, for that of the Oak and Mulberry ; whilst around Naples, 

 as it has been before shown, these trees put forth their leaves 

 one month sooner. 



[Now, in England, we learn from the Naturalist's Calendar, 

 kept from 1768 to 1793, that at Selborne in Hampshire, Mr. 

 White has recorded March 13. as the earliest, and March 

 20. as the latest date, in which he noticed the expansion of 

 the leaves of the Elder ; but Mr. Markwick observed January 

 24. and April 22. as the earliest and latest days for the same 

 occurrence at Catsfield near Battle in Sussex. In the same 

 Calendar, it is also stated that the leafing of the Elm was seen 

 on April 3. by White, and on April 2. and May 19. (earliest 

 and latest) by Markwick. That of the Beech, according to 

 White, occurred on April 10. the earliest, and on May 8. the 

 latest, whilst according to Markwick April 24. and May 25. 

 are the soonest and latest days. And for that of the Mul- 

 berry with the former, May 27. and June 13., but with the 

 latter, May 20. and June 11. are the earliest and the latest 

 dates given. 



By calculating the mean day between the earliest and latest 



