1 98 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



Gayer {con tinned). 

 Tilia parvifolia=T. cordata (small - 



leaf linden). 

 Alniis iniana (hoary alder). 

 Acer (maple). 



Ulmiis niontana (wycli elm). 

 Fraximis excelsior (European ash). 

 Quercus peduncidata (oak). 

 Popidus tremuloides (aspen). 

 Finns sylvestris (Scots pine). 

 Beiula venncosa (birch). 

 Betnla ptibescois (birch). 

 Larix eiiropiea (European larch). 



TUR.SKV (1904 : 32). 



Abies pectinata (silver fir). 



Fagtis (beech). 



Picea (Norway spruce). 



Carpinns hetuhis (European liorn- 



beani). 

 UI lines tuoiitana (wych elm). 

 I'iniis laricio, var. austriaca (Austrian 



pine). 

 Alnns glutinosa (black alder). 

 Fraxinns excelsior (European ash). 

 Que' ens (oak). 

 Populns (poplar). 

 Finns sylvestris (Scots pine). 

 Betnla (birch). 

 Larix europiea (larch). 



IJuHLER {continued). 

 Aliiiis incana (hoary alder). 

 Qnercns (oak). 



Acer platanoiles (Norway maple) 

 Finns montana (Swiss pine). 

 Finns sylvestris (Scots pine). 

 Fopiilus (poplar). 

 Betnla (birch). 

 Larix enropica (larch). 



Warming (1909 : 18). 



Abies pectinata (silver fir). 



Fagns (beech). 



Carpinns betn'ns (European horn- 



Ijeani). 

 7'ilia (basswood or linden). 

 Ficea (Nor\\'ay spruce). 

 Pinns montana (Swiss pine). 

 Aicrpscndoplatanus{%yc2cmQx<fm?ci^\€). 

 Uliiins effusa (spreading elm). 

 Qnercns (oak). 



Fraxinns excelsior (European ash). 

 Finns strobus (white pine). 

 Finns sylvestris (Scots pine). 

 Alnus incana (hoary alder). 

 Fopnlns tremula (aspen- poplar). 

 Betnla (birch). 

 Larix enropcea (European larch). 



The following are scales of tolerance prepared for some of our 

 American trees : 



Westkrn Species. 



\'kry Toi.kkant. 



'Fiixw! brevifolia (western yew). 



Piceaengelmanni{ Engelmann spruce). 



Abies lastocarpj (al|)ine fir). 



Abies concolor (white firj. 



Thuja plicala (western red cedar j. 



7 silica heterophylla (western hem- 

 lock). 



Tsnga inertensiana (mountain hem- 

 lock). 



Picea sitchensis (Sitka spruce). 



Imoi.kkant. 



Abies inagiiifica (red fir). 



Finns ponderosa (western yellow 



pine). 

 Pimis jej)reyi (Jeffrey pine). 

 Pinus laiiibcrtiana (sugar pine). 

 Piiins aristata (ijrislle-cone pine). 



