No. 390.] REVIEWS OF RECENT LITERATURE. 523 
I. In a Raulin solution + 18.4 per cent NaCl: 
A, shows no germination ; 
B, slight germination ; 
C, general germination. 
II. In a Raulin solution + 6 per cent NaCl: 
A, produces spores in 5 days; 
B, produces spores in 4 days; 
C, produces spores in 33% days. 
III. In a Raulin solution, without additional salts : 
A, sporification in 4 ae : 
B, sporification in 5 da 
C, sporification in 5 fed iut slight. 
Spores from cultures III, 4, B, and C, are sowed in Raulin solution 
+ 18.4 per cent NaCl: 
IV. A’, after 5 days, no germination ; 
B’, after 5 days, just visible germination ; 
C’, after 5 days, clearly visible germination. 
Hence (I and II) the Conidia of Aspergillus become adapted to 
the medium in which their parent is growing, and more adapted after — 
the second generation than after the first. 
The adaptation is such that a normal solution is disadvantageous 
to Conidia adapted to a dense solution. 
The adaptation to concentrated medium is not wholly lost after 
rearing in a normal medium. (IV.) There is a persistence of the 
adaptation, there is an inheritance of n acquired quality of resist- 
ance to concentration. 
ZOÖLOGY. 
Evans’s Birds. — The ninth volume of Zhe Cambridge Natural 
History, comprising the Birds, by A. H. Evans,! has just come to 
hand. 
Ornithologists have of late years been favored with several general 
works on the natural history of birds, by competent authors, the main 
object of which has been to present the results of recent studies of 
the structure of the various groups composing this class. On the 
other hand, the usual number of “ popular,” often inaccurate and 
1 Evans, A. H. Birds. The Cambridge Natural History, vol. ix. London, 
New York, Macmillan, 1899. xvi + 635 pp., 8vo, 144 figs. + 2 polar charts. 
