54 BOTANICAL GAZETTE [JULY 
quality to those found in the United States. There are certain notable 
exceptions, however, as the pili nut (Canarium luzonicum), which is abundant 
and superior to the almond in quality, and the wild mango (Mangifera caesia), 
with its delicious flavor. Nuts, seeds, fleshy fruits, buds, leaves, roots, and 
tubers are included in the list, and the drawings and photographs used to 
represent them are of excellent quality. 
A companion report by West and Brown” deals with native resins and 
oil-producing plants, which are rather numerous. One difficulty in the 
utilization of the resins of many of the trees is to be found in the large number 
of species found in any particular area, making the number of individuals of 
any one species in any locality rather small. Several of the oil-producing 
plants give promise of good results under cultivation. In this report, < 
the illustrations and descriptions give much botanical information.—GEoO 
FULLER. 
Ecological research.—In his report of the work of the Carnegie Institu- 
tion for 1920, Director MacDoucaL# indicates the lines of research being fol- 
MacDoveat, and his results seem to show that species may be the more readily 
transferred from cool regions to warm, from montane regions to maritime, and 
from regions of climatic extremes to those of equable climates than the reverse. 
SHREVE reports progress in a soil temperature survey of the United States and 
Canada, in his investigations of the arid Avea Valley, and in his explorations of 
the Santa Lucia Mountains. Mrs. SHREVE has studied seasonal changes in the 
transpiration of Encelia farinosa, and VINSON and GRIFFIN have investigated 
the changing composition of Salton Sea water. The strand vegetation near 
Monterey, California, has been examined by Cooper, and stations and quad- 
rats established for more exact studies of the associations and their controlling 
factors. Evaporation rates on the Monterey peninsula are decidedly less than 
in the oak and chaparral region east of Monterey, and this may account for 
the pine forests covering the former area.—GEo. D. FULLER. 
Calcicoles.—In a discussion of plants found on soils supposed to be cal- 
careous, SALISBURY” makes it clear that the problem of the limitation of the 
West, A. P., and Brown, W. H., Philippine resins, gums, seed oils, and essential 
eils. Phil. Dept. Agric. and Nat. Res., Bur. For. Bull. 20: 1-230. figs. 73. 1920. 
% MacDoucat, D. T., ta ora of botanical research. Carn. Inst. Wash. 
Year Book for 1920. 19: mes 
19 SaLisBuRY, E. J., The See of the calcicolous habit. Jour. Ecol. 8: 202- 
215. 1920. 
