116 



TRANSACTIONS AND PROCEEDINGS OF THE [Sess. lv. 



These results are necessarily crude, because they depend 

 on eye observations. It must also be remembered that the 

 development of the buds is not always simultaneous, or 

 nearly so, in the same tree. Thus in Ahics Loioiana, No. 8, 

 on 26th May only half of the buds were open and green, the 

 other half continuing as hard and brown as in winter till at 

 least June 1st ; and in the elms, although many buds were 

 opening on April 30, quite as many were still closed on 

 May 7th. 



Generally speaking,- the first appreciable movement was 

 much earlier, and much less well defined in the deciduous 

 than in the pinaceous group ; and the tender young leaves 

 of the former were exposed to the weather a month earlier 

 than the young needles of the pines. The earliest tree to 

 make a start appreciable to the eye was the hawthorn, about 

 the end of February, and the latest the Abies Loiuiana on 

 25th May. The extreme range was therefore about 3 

 months. 



2. Correlation of the commencement of growth in 

 girth and in the buds : 



Deciduous 'I'lees. 



Girth-in- 

 crease 

 coin- 

 nieiiced. 



Bmls 

 showed 

 activity. 



No. 



74. Aceri)Heii'lo pbitaiiuH, :'A Miiy IKli Mai'(0 



80. yEscillllsHil/li'Mastuiiili]]. IVIh May lililli M:irr,li 



19. Craticgiis Oxjaiaiitlia, i 7tli May Iht Marcli 



22. Pruiius Pailiis, |ir<lh May 14Ui March 



Vi. Ulmus canipestris, 20th Aprilj2!nli Marcli 



94. Do. Do. Do. 



Bud- 

 activity 

 preceded 

 Girth-in- 

 crease by 



.50 days 

 58 days 

 08 days 

 02 days 

 22 days 

 Do. 



Buds 



hesan to 



open. 



];iud-activity preceded or 

 followed Girth-increase. 



14th April 10 days before girth-increase 



!)th April \%\ ,, 

 2!)th jMarcOi :i!) ,, 



1st A])ril 45 „ ,, ,, 



30th April 10 days after girth-increase 

 Do. Do, 



The differences shown here are very great. Of the five 

 piaes, m the three species of AUcs the girth-increase pre- 



