2OO O. L. IN 7 MAN. 



This bacterium, if isolated in pure culture and grown upon 

 peptone sea water agar of pH 8.1, becomes luminous within 

 twenty-four hours and may be kept so by frequent transfer for 

 at least two years. 



LITERATURE. 



1. Giard, A., and Billet, A. 



'89 Observations sur la Maladie Phosphorescente des Talitres et Autres 

 Crustaces. Compt. rend. Soc. Biol., Vol. i, Ser. 9, p. 593. 



2. Harvey, E. N. 



'20 The Nature of Animal Light, p. 13. 



3. Dahlgren, Ulric. 



'i5-'i6 The Production of Light by Animals. Journal of Franklin Institute, 

 November and December, 1915, January, 1916. 



