Conifers 



The rate of increase shows considerable variation 

 (see below). 



INCREASE IN GIRTH IN INCHES PER ANNUM. 



In Germany there have been many careful researches 

 as to the growth of trees, as is shown by the following 

 table : * 9 



* Kirchner Low and Schroter, I.e. The work by Elwes and Henry, which 

 gives many details for English trees, is unfortunately not accessible to the 

 author. For the rates given for silver firs, Scots firs, &c., the author must 

 express his hearty thanks to Mr. Renwick for notes and reprints. 10 



1 Schimper. 

 * Dengler. 

 7 Masters. 

 10 Renwick. 



a Mey. 

 5 Sargent. 

 8 Haberlandt. 



8 Rikli. 



8 Cieslar. 



9 Kirchner, Low, and Schroter, 



249 



