27^ 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Thuya gigantea suffers sometimes from the cold at Stockholm. 



T. g. aurescens, hort. Thuya gigantea semper a,urea, hort. 

 Thuya Lohhii semper aurea, hort. Thuya gigantea lutescens, hort. 

 Thuya Lohhii lutescens, hort. 



T. g. gracilis, hort. Thuya gigantea gracillima, hort. Thuya 

 Lohhii gracilis, hort. 



I think we cultivate in Denmark more varieties than I have here 

 mentioned, but they have not yet been sufficiently observed to 

 become determined. 



T. occidentalis, L. Spec. PI. 1422. Arhorvitx, Clus. Hist. i. 36. 

 Thuya Theophrastii, Bauh. Pin. 488. Thuya ohtusa, Moench. Meth. 

 691. Cupressus Arborvitse, Targ. Tozz. Observ. Bot. ii. 51. Cedrus 

 Lycia, Clus. Ic. ; Stirp. 11, t. 224. 



Habitat. — New Brunswick to Anticosti Island, through the valley 

 of the St. Lawrence River to the southern shores of James's Bay, 

 and south-east to the eastern extremity of Lake Winnipeg, south 

 through the Northern States to Central New York, Northern Penn- 

 sylvania, Central Michigan, Northern lUinios, Central Minnesota, 

 and along the Alleghany Mountains to the high peaks of North 

 Carolina. 



A tree 40-60 feet in height, with a trunk sometimes 4-5 feet in 

 diameter ; cold, wet swamps, and along the rocky banks of streams ; 

 very common in the North, spreading over great areas of swamp ; 

 extensively cultivated as a hedge and ornamental plant, and pro- 

 ducing innumerable seminal varieties of more or less horticultural 

 value. 



Wood very light, soft, not strong, brittle, rather coarse-grained, 

 compact, very durable in contact with the soil ; the bands of small 

 summer cells very thin, dark-coloured ; medullary rays numerous, 

 indistinct ; colour light brown, turning darker with exposure, the thin 

 sapwood nearly white ; specific gravity, 0-3164 ; ash, 0-37 ; largely 

 used for posts, fencing, railway ties, and shingles (Ch. S. Sargent, 

 "Forest Trees of North America"). The distilled oil and a tincture 

 of the leaves of Thuya have been found useful in the treatment of 

 pulmonary and uterine complaints ("U.S. Dispensatory," ed. 14, 

 1775, and "Nat. Dispensatory," ed. 2, 1728). 



The American Arborvitse is much used in that country for its 

 valuable properties in carpentry. It is very durable ; posts made of 

 it are said to last from thirty-five to forty years, and rails sixty, 

 which is considered three or four times as long as any other species. 

 It is also frequently used in boat-building. The timber is of a reddish 

 colour, very light, and close-grained ; but it seldom attains any con- 

 siderable size in this climate, and is only suitable for the pleasure- 

 ground or shrubbery, where it forms a handsome evergreen tree. Its 

 branches are possessed of a strong aromatic smell. Kalm afiirms that 



