22 



As is quite to be expected, tbe rating arrived at from the summing 

 up of the qualities mentioned differs very considerably from the rating 

 which might be arrived at from the quality of immunity from insects. 

 Taking the large and medium-sized trees only (36 species in all), Mr. 

 Fernow's rating stands as follows, only the total gained by the addition 

 of the ratings in the several qualities considered being given: 



Variety of tree. 



Total 



rating 



(Fernow). 



Insect 



rating 



(Howard). 



LARGE-SIZED TREES. 



Red oak (Quercus rubra) 22 



Scarlet oak (Quercus coccinea) 22 



Yellow oak ( Quercus velutina) 22 



American elm ( Ulmus americana) I 22 



Sugar maple (Acer saccharum) 19 



Black maple (Acer nigrum) 19 



Tulip tree (Liriodendron tulipifera) ! 19 



European linden (Tilia vulgaris) 19 



Small-leafed linden (Tilia microphylla) j 19 



Sweet gum (Liquidambar styraciflua) 19 



White oak (Quercus alba) 19 



Bur oak ( Quercus macrocarpa) : 19 



Oriental plane tree (Platanus orienlalis) i 19 



Kentucky coffee tree ( Gymnocladus divisus) i 19 



American plane tree (Platanus occidentalis) ; 18 



Sycamore maple (Acer pseudo-platanut) , 17 



American linden (Tilia amerieana) 17 



MEDIUM SIZED TREES. 



Red maple (Acer rubrum) 22 



Shingle oak ( Quercus imbricaria) 21 



Willow oak (Quercus phellos) 21 



Slippery elm ( Ulmus pubescens) 21 



Norway maple ( Acer platanoides) 20 



Box elder (Negundo negundo) 20 



European elm ( Ulmus campestris) 19 



Scotch elm ( Ulmut montana) i 19 



Hackberry ( Celtis occidentalis) ! 19 



Silver-leafed maple (Acer saccharinum) | 17 



Tree of heaven (Ailanthus glandulosa) ! 16 



Horse chestnut (&sculus hippocastanum ) i 16 



Japanese sophora (Sophora japonica) 10 



Hardy catalpa ( Catalpa fpeciosa) 16 



Gingko (Gingko biloba) 16 



Honey locust ( Oleditschia triacanthos) 15 



Cotton wood (Populus monilifera) 15 



Balm of Gilead (Populus balsamifera v. candicans) 15 



Black locust (Robinia paeudacacia) 14 



2.5 

 2.5 

 2.5 

 1.5 

 2.5 

 2.5 

 3.0 

 1.5 

 2.0 

 2.0 

 2.0 

 2.0 

 1.5 

 2 

 1.5 

 20 

 1.5 



2.0 

 2.0 

 2.5 

 2.0 

 2.0 

 .0 

 .5 

 1.0 

 1.5 

 1.5 

 2.5 

 2.0 

 2.5 

 2.0 

 3.0 

 1. 



The writer has made ratings of these same trees according to their 

 immunity from the attacks of insects, the trees most immune being 

 rated at 3 and those most attacked by insects at 0. The figures relat- 

 ing to insect attack are displayed above in a contrasted column next to 

 the total rating, and in order that tbe relative importance from the 



