558 Journal of Agricultural Research voi. iv. No. e 



GENERAL CONCLUSIONS ON THE DEVELOPMENT OF SOIL PROTOZOA 

 IN ARTIFICIAL CULTURE SOLUTIONS 



From all data which have been presented in this paper the writer feels 

 that he is warranted in concluding that — 



(i) The development of soil protozoa in artificial culture solutions 

 inoculated with the soils which have been examined varies with the con- 

 ditions of the problem. 



(2) The development of soil protozoa in artificial culture solutions 

 varies with the kind of media employed. 



(3) For each quantity of soil which is used for inoculation there is a 

 variation in the development of protozoa. 



(4) Drying the soil affects the development of soil protozoa. 



(5) There is a variation in protozoan development in every greenhouse 

 soil. 



(6) Field soil causes differences in the protozoan development. 



(7) At each temperature of incubation there is a variation in the 

 development of soil protozoa. 



LITERATURE CITED 



(i) Br6al, E. 



1896. Decomposition des matieres vege tales en presence de I'eau et de la 

 terre. In Ann. Agron., t. 22, no. 8, p. 362-375. 



(2) Cauda, A., and Sangiori, G. 



19 14. Untersuchungen iiber die Mikrofauna der Boden aus Reisgegenden. In 

 Centbl. Bakt. [etc.], Abt. 2, Bd. 42, No. 15/16, p. 393-398. 



(3) Cunningham, Andrew. 



1914. Studies on soil protozoa. II. Some of the activities of protozoa. In 

 Centbl. Bakt. [etc.], Abt. 2, Bd. 42, No. 1/4, p. 8-27. 



(4) and LoHNis, Felix. 



1914. Studies on soil protozoa. I. The growth of protozoa on various media 

 and the effect of heat on active and encysted forms. In Centbl. 

 Bakt. [etc.], Abt. 2, Bd. 39, No. 23/25, p. 596-610. 



(5) Ehrenberg, C. G. 



1837. Die Fossilen Infusorien und die Lebendige Dammerde. 27 p., 2 col. pi., 

 I tab. Berlin. 



(6) France, R. H. 



1911. Studien iiber edaphische Organismen. In Centbl. Bakt. [etc.], Abt. 2, 

 Bd. 32, No. 1/2, p. 1-7. 



(7) Goodey, T. 



1911. A contribution to our knowledge of the protozoa of the soil. In Proc. 

 Roy. Soc. [London], s. B, v. 84, no. 570, p. 165-180, i fig., pi. 4. 



(8) 



1914. Investigations on the protozoa of soil. (Abstract.) In Rpt. 83d Meet- 

 ing Brit. Assoc. Adv. Sci,, 1913, p. 775. 



(9) GrEEFF, Richard. 



1866. Ueber einige in der Erde lebende Amoben und andere Rhizopoden. 

 In Arch. Mikros. Anat., Bd. 2, p. 299-331, pi. 17-18. 

 (10) Killer, J. 



1913. Die Zahlung der Protozoen im Boden. In Centbl. Bakt. [etc.], Abt. 2, 

 Bd. 37, No. 17/21, p. 521-534. 



