544 BOTANICAL GAZETTE [DECEMBER 
Rusts of Oregon.—JACKSON” has published an annotated list of the rusts 
of Oregon, which brings together for the first time the rust flora of a state on 
the Pacific coast. All of the grain rusts recorded for North America (except 
Puceinia Sorghi) are known to occur in the state, and also all of the rusts of 
greenhouse crops. In addition to these, the Pacific coast rust of pears and 
quinces is vnipe to be of ee = ee importance; and of course the 
forest-tree dofinvestigation. The list includes 
220 species of rusts ents on about 500 pretnn hosts, 8 of the species being 
described as new.—J. M. C. 
Practical breeding.—CoLiins and Krempron* have given an excellent 
example of the effective application of the principles of pure science to the 
solution of a practical problem. The production of a race of sweet corn resist- 
ant, to the earworm has been a strictly practical problem, and introduces 
no new phenomena or theories of inheritance. The authors, however, have 
established statistically the correlation between the amount of damage done 
by the earworm and certain superficial plant characters, and have followed this 
by selective breeding for those significant characters MERLE C. COULTER. 
The morning glory in genetics.—BARKER” has found that the morning- 
glory is very favorable material for work in genetics. The almost innumerable 
combinations of floral colors are beautifully explained by the enzyme theo 
“Each epistatic type is due to the addition of one or more gener probably 
enzymatic in nature, which are not present in the hypostatic type.” —MERL 
C. CouLTER 
Rusts of Cuba.—ArtHur and JouNston® have brought together all 
collections of Cuban rusts as a “basis for a thoroughly scientific and economic 
exploration of the island.” The list includes 140 species, 12 of which are 
described as new, 15 are new to the North American flora, and ro are exclusively 
Cuban. a .c. 
ts oi Plein: H.S., The Uredinales of Oregon. Mem. Brooklyn Bot. Gard. 1:198~ 
297. 1918. 
* CoLuins, G. N., and Kempton, J. H., Breeding sweet corn resistant to the corn 
earworm. aie A zig Research 12:549-572. 1917. 
ARKER, E. E., Hereditary studies in the mere cage’ oS ais purpurea). 
Cornell Univ. “i ‘Rae Sta. Bull. no. 392. pp. 38. pis. 3 
3 ARTHUR, J. C., and Jounston, J. R., Uredinales of pa ne Torr. Bot. 
Club 17:97-175. 1918. 
