1886-S7.] Monthly Increase in Girth of Trees. 



59 



Monthly Percentage of Increase in Girth in different Species of 

 Uve7'green Trees, hasecl on five years' measurements {three 

 only for Septembei'). 



Remarks. — The species are arranged in this Table in the 

 order of their vigour in the early part of the growing season. 

 The evergreens under observation were much younger than 

 the deciduous species examined ; but, on the other hand, 

 the generahty of their tribe in the Botanic Garden tend 

 to get prematurely old, and cease to be reliable at a compara- 

 tively early age. 



Arauearias. — Girths, 22, 24, 27 inches. All three, although 

 healthy at first, degenerated afterwards, but the monthly 

 results have been so uniform as to inspire me with consider- 

 able confidence in them. 



Sequoias. — Girths, 32, 32, 36, 38 inches. Two of these 

 have become thin and straggling in the branching, and 

 sinuous at the top, but have followed the same laws of 

 growth as the other two, which preserve their youthful looks. 

 Results therefore reliable. 



Austrian Pi7ie. — Girths, 31 inches. This Craigiehall tree, 

 although it lost two years' growth of its top shoot in 1882, 

 and never acquired another, looks quite healthy, and has 

 grown at the rate of 1| inch a year, so that the results 

 seem reliable enough. 



Cypress. — Girth, 22 inches. Healthy and vigorous, though 

 the annual increase has fallen off progressively in the last three 

 years. 



Abies lovnana. — Girth, 26 inches. Top shoot lost in 1880, 

 and never replaced. The branches and foliage have got thinner 



