- 444 - 
FEHDINANDSEN, C, and ROSTRUP, S- (1912) 
1920. REPORT ON INSECT PESTS AND FUNGUS DISEASES OF THE FIELD AND 
ORCHARD IN 1919. Tidsskr. Planteavl. 27: 399-450. [In Danish. Ab- 
stract in Rev. Appl. Eat. (A) 9: 362-364. 1921.] 
Against the lepidopterous larvae, tobacco extract was used with 
effect. Sprays of tobacco extract containing 1 percent nicotine nere 
successful against Blennocampa ge nieulata . 
FRYER, J. C. F-, STENTON, R., TATTERSFIELD , F., and ROACH, 17- A- (1913) 
1923. A QUANTITATIVE STUDY OF THE INSECTI CIDA1 PROPERTIES OF DSRRIS 
EILIPTICA (TUBA ROOT). Ann. Appl. Bicl. 10: 18-34. [Abstract 
in Rev. Appl. Ent. (a) 11: 249-250. 1923.] 
Tubatoxin and derride appear to be of the same order of 
toxicity as nicotine to the larvae of Bombyx rnori . Nicotine oleate 
in low concentration was immediately and almost completely effective 
against Aphi s rumicis . 
YABUTA, T., and K02U, T. (1914) 
1931. THE TOXIC SUBSTANCE IN THE MULBERRY LEAVES, DAMAGED BY TOBACCO. 
Jour. Agr. Chem. Soc. Japan 7: 932-941. [Abstract in Chem. Abs. 
26: 1008. 1932.] 
The leaves of mulberry, planted near a tobacco field, were 
often toxic for the silkworm ( Bombyx mori) . The mulberry leaves dam- 
aged by tobacco were dried and then treated chemically. The resulting 
precipitate was changed into picrate and then recrystallized. It was 
identified as nicotine picrate. Mulberry leaves to which nicotine was 
artificially added, were also toxic for silkworms. In the damaged 
mulberry leaves nicotine combines with organic acid as salt. The quan- 
tity of nicotine was only l/l00,000 of the fresh leaves. It is diffi- 
cult to remove nicotine from the damaged leaves. 
RITCHIE, A. H. (1915) 
1935. REPORT OF THE ENTOMOLOGIST, 1932. Ann. Rept . Dept. Agr. Tangan- 
yika 1932, pp. 68-72. [Abstract in Rev. A pnl. Ent. (A) 21: 444-'!'. . 
1933.] 
As the period of seasonal activity of a moth ( Cephon odes hylas 
L.) coincides vdth that of thrips, lead arsenate is added to the bordeaux 
nicotine combination spray (Rev. Appl. Ent. (A) 21: 106). 
CHITTENDEN, F. H. (1915) 
1913. THE ABUT I LON MOTH ( COSMOPHILA EROSA HUM. ) . U. S. Dept. Agr. 
Bur. Ent. Bull. 125, 10 pp.,' illus. 
The following spray mixture killed about 95 percent of the larvae 
of this moth on abutilon plants in Virginia: 0.5 oa . 40-percent nicotine 
sulphate, 0.5 lb. whale-oil soap, and 5 gal. lukewarm water (p. 9). 
