10 Progress of Horticulture 



the use and application of Guano will be found at p. 168, by 

 our correspondent, Mr. Robinson. 



Arboriculture. 



The introduction of ornamental trees and shrubs of the 

 more scarce and rare kinds is rapidly extending, and nursery- 

 men are making greater elTorts to add to the very limited 

 number which their collections have heretofore contained. It 

 is gratifying to see the experiments which are now being 

 made to test the hardiness of many trees which have recently 

 been introduced to Great Britain, and some of which, from 

 the elevated regions of warm countries, will be likely to prove 

 hardy in the climate of the Middle and Eastern States. 

 Among those more particularly noticeable, we may name the 

 Cedrus Deodara or Deodar Cedar, from the East, where it 

 forms one of the most majestic trees. In the notes of our 

 foreign tour, we have repeatedly spoken of this cedar, and 

 urged its introduction into our gardens, where it will un- 

 doubtedly prove hardy. A small specimen in our collection, 

 little protected with straw, stood the last winter well : as soon 

 as it has acquired more strength, we shall try it unprotected. 

 The Lucombe Evergreen oak we have proved to be quite 

 hardy ; and specimens now before us, (Dec. 15,) are nearly 

 as green and beautiful as the holly. The Paulownta is 

 another tree, of the habit of the catalpa, producing large pur- 

 plish flowers about the same size, with very large leaves, and 

 of a growth as rapid as the ailantus. It has stood out quite 

 unprotected on Long Island, and we have no doubt it will 

 prove hardy around Boston. The original tree, which stands 

 in the Jardin des PI antes, of Paris, has very much the appear- 

 ance of the catalpa, the leaves not beuig near as large as has 

 been stated, when the tree acquires a moderate size. 



The London Horticultural Society, perceiving the great 

 good which must eventually result from the production of 

 seedling trees and shrubs, has introduced into its schedule of 

 prizes for 1847 two or three liberal ones for the best hybrid 

 trees or shrubs : within a few years great improvements have 

 been made in the lilac, magnolia and some other plants, and 

 no doubt this movement of the Horticultural Society will aid 

 much in inducing amateurs and nurserymen to extend their 



