.'J40 



SOME PROTOZOA FOUND IN CERTAIN SOUTH AFRICAN 



SOILS.— II. 



BY 



H. 13. Fantham, M.A., ]).Se., and Esther Taylor, M.Sc, 

 Department of Zoologij, University of the ]]'it tcatcrsrand , 



Johannesburg, 



Read July 13, 1922. 



Contents. 



Page 



Introduction .' 340 



Material and Methods 341 



Results of Examinations of Various Ordinary (Non-Waterlogged) 



Soils 341 



I. Cape Province Soils 341 



II. Transvaal Soils .347 



III. Orange Free State Soils .348 



IV. Portuguese East African Soils 3.52 



Results of Examinations of Waterlogged Soils 354 



Geographical Distribution of the Protozoa Observed 335 



List of Trophic Protozoa found, up to the present, in Water- 

 logged Soils 358 



Environmental Effects 359 



The Distribution of Protozoa in Culture Fluid a 364 



Sequence of Appearance of Protozoa in Cultures of Soil from 



Different Depths 365 



The Succession of Dominant Types 367 



Sporadic Appearances of Protozoa in Certain Cultures 367 



Seasonal Variation in the Protozoal Fauna of Soils 368 



Summary 370 



Introduction. 



The present paper contains an account of some further results 

 obtained b}^ us in our investigations of the Protozoa of South 

 African soils, and is a continuation of the work on which a report 

 was made to this Association last year. (See this Journal, vol. 

 XVIII, pp. 373-893.) 



Further samples of soils from places in the Cape Province 

 and the Transvaal have been e.xamined, and a commencement 

 has been made in the examination of soils from places in the 

 Orange Free State, which was not possible before, while a few 

 samples from the LourenQO Marques district were obtained. 

 Further examinations of waterlogged soils have also been made. 

 Observations on environmental effects have been continued. 



