IV BUREAU OF ANIMAL INDUSTRY. 
Part 21, pages 1575-1624.— Authors O to Ozzard. Issued July 8, 1908. Price 10 
cents. 
Part 22, pages 1625-1718.— Authors P to Pfeilsticker. Issued February 13, 1909. 
Price 15 cents. 
Part 23, pages 1719-1805. — Authors Pfender to Qvortrup. Issued February 16, 
1909. Price 15 cents. 
Part 24, pages 1807-1893.— Authors R to Rizzo. Issued October 9, 1909. Price 
10 cents. 
Part 25, pages 1895-1979. — Authors Roack to von Rzewuski. Issued November 
29, 1909. Price — cents. 
Part 26, pages 1981-2076.— Authors S to Schnyder. Issued June 2, 1910. Price — 
cent.-. 
Part 27, pages 2077-2168. — Authors Schoch to Silvestrini. Issued . Price 
— cents. 
SUBJECT INDEX. 
Trematoda and trematode diseases <Bull. 37, Hyg. Lab., U. S. Pub. Health & 
Mar.-Hosp. Serv., Wash., June, 1908, 401 pp. [W a , W m .] 
