14 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



an opportunity of perusing the valuable paper contributed in 

 the same year to the Proceedings of the Royal Irish Academy^ 

 volume XXXV., Section B, No. ,5, by Professor Henry and 

 Miss Margaret Flood — the former of whom shares with Mr 

 Elwes the distinction of being regarded as the leading British 

 authority on Pacific Coast trees. Professor Henry and Miss 

 Flood deal systematically with all the known representatives of 

 the genus Pseudotsi/ga, to which the Douglas fir belongs, but 

 devote special attention to the three forms that are represented 

 in the forests of the Pacific North-West, viz. : — 



Pseudotsuga Douglasii, Coast or Oregon variety. 

 Pseudotsuga Douglasii^ Caesia variety. 

 Pseudotsuga Dougiasii, Glauca variety. 



The authors follow Mayr in regarding the last as a distinct 

 species, Pseudotsuga glauca. 



As regards the botanical characteristics of the different 

 varieties of Pseudotsuga Douglasii on which the classification 

 adopted by Professor Henry and Aliss Flood is based, I find 

 myself in a position to corroborate the authors' descriptions, 

 but this agreement does not extend to our respective accounts 

 of the geographical distribution of the different varieties. In 

 these circumstances, and in view of the fact that my researches 

 have not as yet been carried beyond the initial stages, no 

 objection may be taken to my making frequent references to a 

 publication, one of whose authors has made a life-long study of 

 the Douglas fir. In describing the cones of the different 

 varieties, I propose to follow the lines laid down by Professor 

 Henry and Miss Flood, without, however, going so minutely as 

 they have done into details, that are chiefly of interest to the 

 systematist, and not essential for purposes of identification. I 

 have also freely made use of the information contained in The 

 Forests of British Columbia — published by the Commission of 

 Conservation, Canada, and prepared by Messrs Whitford and 

 Craig— a survey of the forest resources of the province, and 

 probably the most complete work of its kind, that has been 

 published for any part of the British Empire. Other works 

 which have been consulted are The Reproduction of Commercial 

 Species in the Southern Coastal Forests of British Columbia., by 

 Howe — an illuminating report prepared at the request of the 

 Committee on Forests, Commission of Conservation ; The 



