G. S. Graham-Smith 
53 
5 . The characters of the colonies formed by organisms exhibiting 
loop-forming, folding and snapping post-fission movements are not 
markedly altered by the condition of medium under ordinary conditions 
of cultivation. When thickly sown on moist agar continuous growths 
are formed by all of them, but the edges of these growths resemble the 
edges of the separate colonies. All organisms exhibiting slipping post¬ 
fission movements form films on moist agar. Under unsuitable conditions 
for film formation the larger and stronger members produce either 
colonies with radiating processes on moderately moist agar, or rounded 
colonies on dry agar. The smaller, weaker, and slower growing members 
produce colonies which to the naked eye appear more or less rounded. 
REFERENCES. 
Hill, H. W. (1901). Notes on the morphology of B. dvphtheriae. 30 th annual 
report of the Health Department, City of Boston, p. 79. 
Hill, H. W. (iii. 1902). “ Hanging block ” preparations for microscopic observation 
of developing bacteria. Journ. of Hed. Research, vii. p. 202. 
Hill, H. W. and Rickards, B. R. (1903). Notes on Morphology. American Pub. 
Health Assoc. Proceedings of ?>0th annual meeting. 
Hutchinson, H. B. (1906). Ueber Form und Bau der Kolonieen niederer Pilze. 
Centralb. f. Baht. xvii. p. 63. 
Kurth, H. (1898). Ueber die Diagnose des diphtheriebacillus unter Beriicksichtigung 
abweichender Culturformen desselben. Zeitschrift f. Hygiene, xxvm. p. 409. 
Nakanishi, K. (vii. 1901). Ueber den Bau der Bakterien. Centralb. f. Baht. xxx. 
p. 97. 
Rickards, B. R. (1901). A system of recording cultures of bacteria genealogically 
for laboratory purposes. 30 th annual report of the Health Department, City of 
Boston, p. 75. 
