148 HORTICULTURAL SOCIETY OF NEW YORK. 



ported from the northern section of the Alkivial Deposit in 

 IlHnois. Whether those growing in the northern part of the 

 city are native, or have been introduced, I do not know. 



Of the vegetation introduced to the Prairie indigenous to 

 the region, I desire to mention : 



Fraxinus quadrangulata. 



Tulip Tree. 



Acer saccharinum. 



Acer rubrum. 



Prunns serotina. 

 We will now come to the third group — Introduced Vege- 

 tation. 



Referring to the Alorain, — 



^Magnolia hypoleuca, 



Gleditsia triacanthos, 



Ulmus campestris, 



Acer platanoides, 

 have been introduced with more or less success. The magnolia 

 can be found in specimens almost twelve inches in diameter in 

 old gardens as far as ^^'aukegan on the "Lake Border Morain." 

 Gleditsia triacanthos is also found in large specimens, and 

 the Xorway Alaple grows very rapidly, and attains an enormous 

 size on this formation. Ulmus campestris is dying out after 

 about thirty years of growth, but disseminating itself through 

 seeds before it succumbs to natural conditions deadly to its 

 existence. 



On the Plain or Glacial Drift the same varieties have been 

 introduced, and those specimens still remaining show the hard 

 struggle they have to make for existence. Magnolia hypoleuca 

 grows very slow, and as no specimens exist over fifteen years 

 old it is impossible to state at this time how long they will be 

 able to live on this formation. Acer saccharinum succeeds very 

 poorly, and Acer rubrum after a few years of trial succumbs. 

 Acer platanoides (Norway Alaple) struggles along and has so 

 far succeeded in holding its own under favorable conditions, but 

 does not attain a height over 25 or 30 feet, 



Prunus serotina is not much better off than Acer rubrum. 

 Gleditsia triacanthos grows into large specimens, and seems 



