-223- 
(112) DALZIEL, J* M. 
1937* The useful plants of west tropical Africa* 612 pp. 
London* 
(113) DAVIDSON, W. M. 
1929* Inseoticidal tests with oils and alkaloids of larkspur 
(Delphinium oonaollda ) and stareaaore ( Delphinium 
staphisagrlaJ Z Jour* Eoon* Bit* 22 t 226-234* 
(114) DAVIS, G. C* 
1890* Soae new insecticides and their effect on cotton worms* 
Ark* Agr* Expt* St a* Bui* 15, 10 pp. 
(115) DAWE, M. T. 
1922* Sfwatakala grass ( Melinls minutiflora) as a means for 
the control of the tsetse fly. Trop. Life 18* 69-71. 
(116) DELASSUS 
1924* Les inseotes ennemis de 1'oliTier en Algeria. Rer. Agr* 
de l'Afrique du Word. 22s 135-139, 151-155. 
(117) DB ONG, E. R. 
1931* Refined pine tar oil for orchard and garden use. Jour* 
Boon* Bnt. 24s 736-743* 
(118) DICKB, R. J. 
1943. A contribution to the development of sabadilla as an 
inseotioide* 123 pp. (Thesis, Ph. D«, Wisconsin 
TJnir*) 
(119) DIBWER, P. 
n 
1936* Bekampfung Ton Pflansensohadlingen* German Patent 
890*497, See* IU 
(120) DOGIEL, J* 
1877* Anatomic und Physiologic des Hersens der Larre Ton 
Corethra plumioornis. Aoad* Imp* des Sol* St* Peters- 
burg, Mem* (?) U (l0)s 1-37. 
(121) DRAGENDORFF, G. 
1898* Die Heilpflansen der verschledenen Volker und Zeiten* 
884 pp* Stuttgart* 
(122) DRORT, H. 
1868. The useful plants of India* 569 pp* Madras. 
(123) DURHAM, H. E. 
1926* Non-ar8enioal preparations for garden use* Gard. Chron. 
(3) 79s 213-214* 
