ot 
The artificial bog was successfully operated this year, and 
the success is probably due to the fact that material transported 
in barrels from a pine-barren bog in New Jersey was used to 
fill it. Leaks were also practically stopped by lining the concrete 
basin with blue clay. 
The success of the shaded walk, with specially prepared 
soil, mentioned in my last report, has proved the desirability of 
continuing and, if possible, enlarging this feature, as by it we 
were enabled to cultivate many American woodland species, not 
possible of cultivation in the open. Genera successfully cul- 
tivated during 1912 include, Gaultheria, Trillium, Dalibarda, 
Coptis, Sanguinaria, Caulophyllum, Mitella, Tiarella, Epipactis, 
Actaea, Chiogenes, Pyrola, and Cypripedium. ‘The trailing ar- 
butus failed to establish itself. Without these highly specialized 
conditions it would be impossible to grow most of the plants 
mentioned above. 
The economic garden was maintained as during 1911, the 
proposed change of grade making it unwise to remodel it into 
its permanent form. ‘The morphological section (Section IIT) 
was added to and revised, and the contents of the first 18 beds 
were removed to the nursery to make way for grading opera- 
tions. This collection will probably not be intact until some 
time in the summer of 1913. 
It is in the nursery that the greatest growth has been evi- 
denced. Besides a gift from Isaac Hicks & Son, in the early 
spring, of several evergreens and deciduous trees and shrubs, 
the Garden has received 644 species of woody plants, nearly all 
of which have been placed temporarily in the nursery. ‘These 
are represented by from two to four plants of each species. 
From the Arnold Arboretum the Garden secured 514 species 
of shrubs, trees and vines, all purchased, represented by one or 
sometimes two or three specimens of each kind. More than 
375 of the species secured were collected by Mr. E. H. Wilson 
during four trips to western China, and it is these Chinese plants 
that add so much to the botanical value of the collection. The 
rest of the 514 species are, in part, rare and otherwise interesting 
plants, many of them also from China, and collected by Mr. 
W. Purdon, the remainder being of general botanical and horti- 
