Apbil 29, 1910] 



SCIENCE 



651 



the modern system of Engler. Finally, it 

 also illustrates in some detail the variety in 

 structure and in geographical distribution, 

 found among the members of a few selected 

 families of seed plants, e. g., of Ginkgoaces, 

 Saururaeese, Liliaceaj and Composite. Sec- 

 tion IV. contains a selected series of useful 

 and of ornamental plants, chiefly those 

 native to temperate regions, though a few 

 of the more important tropical, economic 

 plants are shown. 



In the further development of the bo- 

 tanical garden it is planned to illustrate 

 various types of plant communities, some 

 of the important facts of geographical dis- 

 tribution and the habitat relations of vari- 

 ous growth-forms. It is expected that the 

 general planting of the Homewood grounds 

 may be carried out in such a way that the 

 groups of shrubs and trees so used shall 

 have scientific as well as an ornamental 

 value. 



The efficiency of a garden as an educa- 

 tional factor is determined, in large degree, 

 by the design and arrangement of the labels 

 used to designate the individual plants and 

 the plant groups shown. 



The series of types of structure, rela- 

 tionship, etc., shown in each section of 

 the garden at Homewood, is divided into 

 successively subordinate groups. These 

 groups are: division, subdivision and 

 groups without names but designated by 

 letters and signs. 



Each individual type of structure, etc., 

 is designated, in this guide and on the 

 labels, by a number. All species used in 

 the garden to illustrate a given type bear 

 the number of this type on their labels. In 

 the guide this number is found at the 

 extreme left of the page, opposite the name 

 of the group. In the garden these num- 

 bers are at the bottom on the group labels 

 and at the top on the species labels. 



The numbers at the bottom of a group 



label indicate the kinds and number of 

 types of structure included in the group. 

 For example: the numbers 16-19 on the 

 label for subterranean stems indicate that 

 the types included in this category are 

 those bearing these numbers, in the guide 

 and on the labels, i. e., rhizomes, tubers, 

 corms and bulbs; the numbei-s 288-290 on 

 the label for indehiscent fruits indicate 

 that this group includes the achene, nut 

 and caryopsis. 



The number at the top of a species label 

 indicates the type of structure, relationship 

 or economic plant illustrated by this spe- 

 cies. A reference to this number in the 

 guide, or in the garden, to the nearest 

 group-label bearing this number, shows 

 what is illustrated by the species. For ex- 

 ample: any species label bearing the num- 

 ber 8 indicates that the plant illustrates 

 the use of the roots as tendrils ; the number 

 529 indicates that the species belongs in the 

 series Resales of Engler; the number 600 

 designates the species as a cereal. 



The location in the garden of the illus- 

 trations of any particular group of struc- 

 tures or relationships may be readily seen 

 by a comparison of the outline of the chief 

 groups (p. 653) and the plan showing the 

 arrangement of beds in the garden (figure, 

 p. 652). On the latter the area devoted to 

 each division is indicated by heavy lines 

 between beds. Section I. is in the north- 

 east quarter of the garden, the types being 

 numbered from 1 to 113. Section II. is in 

 the southeast quarter (Nos. 200-313). 

 Section III. is contained chiefly in the 

 southwest quarter (Nos. 400-558), but 

 partly in the northwest quarter (Nos. 559- 

 571). Section IV. is also contained in the 

 northwest quarter (Nos. 600-652). The 

 sequence of the types within each quarter 

 is readily seen from the numbers on the 

 labels. These are arranged in regular suc- 

 cession along the beds as far as possible, 



