94 PROTECTION OF PLANTS — 1923-24 



1918, Kiessling, L. — The injurious secondary effects of the formahn treatment 

 of seed grain, on germination. Jour. Landw. Bd. 66:7-51. (Bot. Abs. 

 2:134). 



1920, Braun, Harry. — Presoak method of seed treatment. J. A .R. 19: 363-392. 



Hurd, Annie May. — Injurv to seed wheat resulting from drying after 

 disinfection with formaldehyde. J. A. R. 20:209-244, plates 41. 



1921, — Seed-coat injury and viability of wheat and barley 



as factors in susceptibility to moulds and fungicides. J. A. R. 21:99- 

 121, plates 23. 



1922, Howitt, J.E. and R. E. Stone. — Results of four years of co-operative ex- 



periments with (dry) formaldehyde for the prevention of oat smut Ann. 

 Rept. for 1921 Agr. and Exp. Union, Ont. Dept. Agr. pp. 27-30. (Abs. 

 Rev. App. Mycology 1:436). 



1923, Eraser, W.P. and P. M. Simmonds. — Co-operative experiments with 

 copper carbonate dust and other substances for smut control. Sci. 

 Agr. 3:297-302. 



1924, Tisdale et al. — Water and hme-water baths following the formaldehyde 



seed treatment. Phytopath. 14:43. (Abstract). 



A PRELIMINARY NOTE ON SOME ENDOPHYTIC PROTOZOA. 

 Dr. E. Melville Du Porte 



Macdonald College, P. Q. 



The first record of a protozoon parasitic in plants was made by Lafont in 

 1909, when he and his assistant David discovered in Mauritius a flagellate 

 parasitic in the latex of Euphorbia pilulifera. Lafont named this organism 

 Leytomonas davidi, and two j'ears later announced that a hemipterous insect 

 Nyssius euphorhiae is responsible for its transmission. Since that time several 

 workers have contributed to our knowledge of L. davidi — its morphology, hosts 

 and method of transmission. Other workers have shown that this is not an 

 isolated case but that many other lactiferous plants, belonging to several 

 unrelated groups, carry flagellates and amoebae in their latex. In this connec- 

 tion special mention should be made of a series of excellent papers published by 

 G. Franchini of the Pasteur Institute of Paris. 



In the summer of 1923 the writer commenced a survey of the lactiferous 

 plants in his vicinity, and was gratified to find flagellates or amoebae constantly 

 present in several species of indigenous and exotic plants. The following plants 



