80 
She influence of Temperature on the Progress © 
of Vegetation tw the ecavly months 
of the Wear. 
By THOMAS GIBBS. 
(Read before the Society, January 6th, 1888.) 
aIS the Calendar of Nature has been a regular feature in 
our Annual Report since 1878, it has been thought 
desirable that a summary with some notes thereon 
should be embodied in this Volume of Transactions, 
and I have undertaken the preparation of such a summary. 
The Calendar of Nature was started by Mr. C. U. Tripp, one 
of the founders of this Society and its first Secretary, during the 
time when the Society had its head-quarters at the Grammar 
School ; and, until Mr. Tripp left Burton in 1883, a large pro- 
portion of the observations were contributed by the scholars. 
Since then it has been continued by a “few members of the 
Society, the principal being the Rev. C. F. Thornewill and 
Messrs. F. W. Andrews, J. E. Nowers, J. G. Wells, and myself ; 
the observations of these few are, however, if not quite so 
numerous, at any rate more systematic and reliable than those of 
the first few years. 
For this summary I have prepared the two following tables, 
the first of which refers to the dates of flowering of nineteen 
plants which have been most regularly observed, and the second 
to a few miscellaneous phenomena, such as the singing of birds 
and appearance of insects, and including also the leafing of the 
Hawthorn, which I have here inserted as the only tree whose 
leafing has been at all regularly observed :— 
