436 
ROLE Phenomena of Vegetation at Thirsk in 1855. 
By J. G. Baker. 
The spring of last year was so exceptionally late and inclement, 
that the dates of the foliation and florescence of plants were re- 
tarded considerably beyond the usual time. The following lists 
have reference exclusively to the neighbourhood of Thirsk, and 
to a district the average annual temperature of which is rather 
above 48°. They are taken from a note-book to which contri- 
butions were made by various members of our local Natural 
History Society, and each contains only such species as are in- 
cluded in the Tables issued by the Committee of the British 
Association for the registration of Periodic Phenomena. I have 
given the mean temperature of the first six months of the year 
in 1855, and the number of days.during each, in which the mer- 
cury sank below 32° Fahr., for comparison with the average. 


Montus. 
1 ed eens A 5 6 






Mean temperature in 1855. . | 384°7 | 25°9 |36°3 |43°3 |45°8 | 55-0 
Average mean temperature . . | 34°8 | 37°3 |40°7 |47°6 | 545 | 59-2 
Number of frosty daysin 1855 | 21 =| 28 21 al 7 0 
Average number of frosty days | 17+] 18+) 12+) 8 1—| 0 



I. Foliation of Trees and Shrubs.—8rd mo. 20th, Pyrus japo- 
nica. 4th mo. 4th, Ribes Grossularia; 12th, Sambucus nigra; 
13th, Lonicera Periclymenum ; 14th, Ribes rubrum; 17th, Ribes 
nigrum, Syringa vulgaris; 18th, Crataegus Oxyacantha, Prunus 
Armeniaca, P. domestica, Rubus Idzus; 19th, Adsculus Hippo- 
castanum ; 25th, Ribes alpinum; 30th, Pyrus communis. 5th 
mo. 2nd, Fagus sylvatica; 5th, Cytisus Laburnum; 6th, Acer 
Pseudo-platanus, Corylus Avellana; 13th, Salix alba; 18th, Vac- 
cinium Myrtillus; 20th, Pyrus Aucuparia, Tilia parvifolia; 21st, 
Populus tremula; 22nd, Prunus Avium; 24th, Quercus pedun- 
culata, Vitis vinifera; 25th, Betula alba, Populus alba, Fraxinus 
excelsior. 
Il. Florescence of Trees, Shrubs, and Herbaceous Plants.—2und 
mo. 28th, Galanthus nivalis. 3rd mo. 4th, Crocus vernus, Bellis 
