94 BULLETIN 824, U. S. DEPARTMENT OF AGRICULTURE 
(S29) Van Laren, A. J. 
De Cultuur in Frankrijk van Pyrethrum cinerarizfolium en de 
Bereiding van Pyrethrum-zeep (savon-pyréthre) voor Cultuurdoelein- 
den. Pharm. Weekblad, v. 60, pp. 877-892. 1923. 
(S30) WuinpiscH, RicHarpD. 
Mit Ocker verfalschter gemahlener Zimt nebst einem Beitrage zum 
Aschen- und Sandgehalt des Insektenpulvers. Z. Nahr. Genussm., 
v. 41, pp. 78-81. 1921. 
(S31) Yamamoto, Ryo. 
The Insecticidal Principle in Chrysanthemum cinerarizfolium. I. 
J. Tokyo Chem. Soc., v. 40, pp. 126-47. 1919. (Chemical Abstracts 
ve 13):p. 122K. 19193) ; , 
($32) 
Insecticidal Principle in Chrysanthemum cinerarizfolium. II and 
III. Constitution of Pyrethronic Acid. J. Chem. Soc. (Japan), v. 
44, pp. 311-30; Wikwagaku Kenyujo-Ih6 (Rept. Inst. Phys. Chem. 
Research), v. 2, pp. 54-9. 1923. (Chemical Abstracts, v. 17, p. 
2704. 1923.) 
(S33) , AND Sumi, Mizuno. 
Insecticidal Principle in Chrysanthemum cinerarizfolium. IV. 
Insecticidal Principle Produced on Dry Distillation of Chrysanthemum 
cinerarizfulium. J. Chem. Soc. Japan, v. 44, pp. 1070-85. 1928. 
(Chemical Abstracts, v. 18, pp. 3169-70. 1924.) 
(S34) Ziaur, W. H. 
The Pharmacology of Pyrethri flores. J. Am. Pharm. Assoe., v. 
12, pp. 19-26. 1923. 
