308 TRANSACTIONS AND PROCEEDINGS OF [Sess. lvi. 



Facjus sylvatica (two) the only growth recorded was 0'05 

 once. On the other hand, in Ulmus campestris (two) April 

 increase was recorded six times ; in Crataegus Oxyacantha 

 (one) three times ; and in Cytisus Laburnum (one) four 

 times. Hence there seems to be a greater tendency to 

 April growth in some species than others. 



The total amounts for April were O'SO in 1887, 0-60 in 

 1888, 0-85 in 1889, 0-45 in 1890, and 0-00 in 1891. 



3Iay. The annual average of trees yielding no increase 

 was four of the 30, and yielding only 0'05 it was eight; on 

 the other hand, an annual average of seven trees reached 

 0"20 or upwards, while 0*30 was recorded once in both 

 specimens of Acer Fscudo-platanus, and in Salix sp., and 

 twice in Ulmus camjKstris. 



The total amount of May growth was 3-25 in 1887, 4*20 

 in 1888, 3-60 in 1889, 3-50 in 1890, and only 1-90 in the 

 very late season of 1891. 



June. Growth failed altogether on an average in only one 

 instance annually, and reached only 0*05 in the same ratio. 

 These deficiencies were no doubt due to temporary causes. 

 Many of the trees grew from 0*30 upwards, and the following, 

 belonging to six species, reached half an inch or upwards : 

 Acer, Ulmus, ^sculus, and Fojmlus, 0'50 ; Acer, Ulmus, 

 Fagus, Fopuhis, Frunus, 0"55 ; Acer, Ulmus, 0"60 ; and 

 Uhnis, 0'65. 



The total June growth was almost identical in 1887 

 (10-20), 1889 (10-50), and 1890 (10-15), but was only G-00 

 in 1888 and 6-95 in 1891. The latter depression was 

 probably due to the late season ; but in 1888 it was 

 apparently owing to some fault in the month itself, as the 

 season was early, the increase of Apiil and May having 

 been alcove average. 



July. Total failure or very restricted growth was in 

 nearly the same small ratio as in June. Many species 

 increased 0-30 or upwards in a single year, and the following 

 attained half an inch or more : Acer, Fopidus, Fagus (thrice 

 in the two trees), Ulmus, 0-50 ; Fopuhcs, Salix, 0-55 and 

 0-GO ; FopuhtH, 0-05. 



The total July growtli was G-75 in 1887, 7-20 in 1888, 

 9-35 in 1889, 9-70 hi 1890, and 8-80 in 1891. 



August. Gnnvlh failed entirely in three out of the thirty 



