24 BULLETIN 819, U. S. DEPAKTMENT OF AGRICULTURE. 



il. Formaldehyde gas, 1 part to 2,500 parts of water (0.04 per 

 cent solution), kills the yeast. 



12. The pink yeast belongs to that group of yeast-like forms called 

 Torulae. Since the complete life cycle of the Torulse is unknown they 

 are placed among the Fungi Imperfecti. 



13. The principal source of contamination of oysters with the pink 

 yeast is in the process of handling in the oyster house. 



14. The shell pile of the opening house is a favorable place for the 

 yeast to grow, and when the shells are later deposited on the oyster 

 beds they serve to distribute the yeasts in the water. 



15. For the purpose of preventing the infection of opened oysters 

 by the yeast, the house and utensils should be washed occasionally 

 through the opening season with a 1 to 2,500 formaldehyde solution 

 (formalin, 1 to 1,000). 



BIBLIOGRAPHY. 



1850. Fkesenius. Beitr. Mykol., Frankfort, 1850-63. 



1872. SoHROTER and Cohn. Beitr. Biol. Pflanz., 1 : 110. 



1879. Pasteur. Etudes sur la biere. 



1886. Elfving. Oversigt Finska Vet. Soc. Forhandl., 28. 



1887. LiNDNEB. Wochschr. Brau., 4: 853. 



1889. Laurent.. Centr. Bakt., 5 : 794. 

 3*890. Demme. Gentr. Bakt., 9:271. 



1890. Kayser. Le Cidre, 3: 371. 



1890. Van der Hulle and van Laer. Abst. In Wochsctir. Brau., 8 : 984. 



1891. Kramer. Abst. in Chem. Centr,, 2 : 707. 



1892. Krueger. Molkereizeitung Hildesbeim, nos. 34-38. 

 1892. Ward. Abst. in Wochschr. Bran., 19: 75. 



1894. Fischer and Brebeck. Zur Morphologie, Biologie u. Systematik d. 



Kahmpilze d. Monilia Candida Hansen u. d. Soorpilze. Jena. 



1895. Peglion. Staz. sper. agrar. ital., 28:369. 



1896. Bat. Centr. Bakt., 2: 259. 

 1896. Swan. Centr. Bakt., 2: 1. 



1898. Hansen. Centr. Bakt., 4: 862. 



1899. Meissner. Centr. Bakt., 5: 232. 



1900. Reinmann. Centr. Bakt, 6: 131. 



1902. Hansen. Compt. rend. trav. lab. Carlsberg, 6: 68. 



1903. Hartmann. Centr. Bakt., 10: 463. 

 1903. Herzog. Z. physiol. Chem.. 38: 396. 



1903. Janssens and Mertens. La Cellule, 20 : 351. 



1912. Klein and Gordan. Centr. Bakt, 35:601. 



1914. Bates and Round. The Occurrence of Pink Color in Shucked Oysters 



Noted During the Fall of 1914. U. S. Dept. Agr., Bur. Chem. Prelim. 



Rept (unpublished). 

 1914. Henrici. J. Med. Res., 30: 409. 



1916. Chapman. Biochem. J., 10:. 548. Bull. Inst Pasteur, 15:616. 

 3917. Wells. Vermont Exp. Sta. Bull. 203. 



WASHINGTON : GOVERNMENT PRINTING OFFICE : 1920 



