122 ESTABLISHMENT OF A NATIONAL BOTANIC GARDEN. 



the arboretum. Books relating to trees have been most carefully in- 

 dexed so that information can easily be obtained about any given 

 species.. 



The collection of trees in the arboretum was arranged by groups of 

 species which are called genera, and the genera, so far as it has been 

 found practicable to do so. have been planted according to their 

 botanical relationships into family groups. The plan will show the 

 positions of these groups. 



There is an administration building which contains the library and 

 herbarium, the administrative offices and laboratories, and a collection 

 of the woods of North American trees. 



There is a small greenhouse used for garden propagating pur- 

 poses. 



From the Arnold Arboretum as a center, expeditions have been 

 sent to all parts of the North Temperate Zone, and very full collections 

 have been made of the trees and shrubs from these regions. For ex- 

 ample, the work done in China has led to the publication of Plantse 

 Wilsonianse. which is one of the latest and best works on the flora 

 of China, and is accompanied by two magnificient atlases including 

 over 1,000 large-size photographs. Similar exploration and similar 

 2niotographs have been made in Japan, Korea, and Formosa. 



In December. 1882, a contract was made between the university 

 and the city of Boston, which was to last 1,000 years. The city was 

 to construct and maintain, under the direction of its park commis- 

 sion, the drives and walks, which were planned by a landscape archi- 

 tect retained by the city, to police the grounds, and assume all taxes 

 which might be levied. The university agreed to open the arboretum 

 to the public from sunrise to sunset during every day in the year, 

 reserving, however, entire control of all the collections and of the 

 grounds with the exception of the drives and walks. 



Upward of "> ( i species of birds have been breeding here during the 

 last l ; <» years. Among them there are the song thrush, veery, rose- 

 breasted grosbeak, thrasher, oriole, bluebird, wood pewee, indigo 

 bird, redstart, warblers, ruffed grouse, quails, Mongolian pheasant, 

 green heron, night heron, great blue heron, and several species of 

 wild ducks (these last four are only occasional visitors), yellow- 

 breasted chat, Brewster's warbler, Carolina wrens, mockingbird, tree 

 sparrow, white-throated sparrow, myrtle warbler, butcherbird, pine 

 grosbeaks, crossbills, redpolls, siskins, snow buntings, titlarks, water 

 thrush, red-shouldered hawk. Cooper's hawk, sharp-shinned hawk, 

 and the screech owl. 



Prof. Sargent's " Sylva of North America" is a noteworthy publi- 

 cation from this institution. (See map.) 



lo. Tin: Botanic Garden of Harvard University, Cambridge, Mass. 



[Extract from article by Prof. X. L. Britton, in Science, Vol. IV, Xo. 88, 1896.] 



7 acres in area: founded in l v ".">. 



There are about 7 acres of land under cultivation, a small green- 

 house, and a famous herbarium and library, from which have flowed 

 during the past 4<> years voluminous and invaluable contributions to 

 taxonomy ami morphology, especially of North American plants. 

 There is also a small morphologic laboratory. The main laboratories 



