684 EXPERIMENT STATION RECORD. 



dilutions from 1:100 to 1:5,000. Polyvalent test fluids yield more uniform 

 results than monovalent fluids, although in birds of marked infection mono- 

 valent test fluids gave very good results. Test fluids, if properly preserved on 

 ice, will keep in a very active state for more than two months. 



"Rabbits reacted to injections with pure cultures of B. imUorum, but by 

 careful immunization yield very active agglutinins and also bacteriolytic sera. 

 Agglutinins produced by immunizing rabbits are much more stable than those 

 from hens harboring the organism. 



"A striking pathological condition found in the ovaries of all birds was the 

 exhibition of lobulated and retention cysts which varied greatly in size. From 

 these it was usually easy to isolate B. puUorum." 



BURAL EirariTEERINa. 



Irrigation practice in Montana, H. B. Bonebright (Montana 8ta. Circ, 29 

 {1913), pp. 25-12, figs. 32). — This circular gives in popular language a compi- 

 lation of detailed information regarding irrigation practice in Montana and 

 related subjects which are of interest to the irrigation farmer. 



Annual irrigation revenue report of the Government of Bengal {Ann. 

 Irrig. Rev. Rpt. Bengal, 1912-13, pp. 16). — The physical and financial conditions 

 of the irrigated districts of the Province are reported. 



Report of the board of state engineers {Rpt. Bd. 8tate Engin. La., 1912- 

 1914, PP- 112, pi. 1). — This report deals with drainage reclamation in the State 

 and also with highways, highway bridges, and other State engineering work. 

 A large part of the data as to drainage by levee districts has been previously 

 reported in publications of this Department (E. S. R., 31, p. 185). 



Some fundamental engineering features in the drainage of arid soils, 

 R. A. Hart {Iowa Engineer, 14 {191^), No. 8, pp. 308-311).— The author deals 

 chiefly with the drainage of irrigated soils, discussing the main features of 

 such work and pointing out the difference between the drainage of arid and of 

 humid soils. It is stated in conclusion that arid soils containing less than 0.2 

 per cent of alkali salts need little consideration, but that soils containing 

 over 0.4 per cent of salts, by weight of the soil, need drainage. 



Report upon the Black and Boggy Swamps drainage district, Ham.pton 

 and Jasper Counties, S. C, F. G. Eason {U. S. Dept. Agr. Bui. II4 {1914), 

 pp. 21, figs. 3). — This report describes the district and the proposed drainage 

 plan and briefly discusses the problems involved. 



The district is approximately a rectangle. 12 miles long northwest and south- 

 east, and miles wide. The north, east, and west boundaries are formed by 

 natural watershed lines, with no natural boundary on the south. The general 

 slope of the ground is southward toward the coast and westward toward the 

 Savannah River, which is the outlet for all the drainage of the district. The 

 two main drainage channels for the district are Boggy Swamp, serving the 

 northern and western parts, and Black Swamp, serving the eastern part. The 

 poor drainage conditions are attributed to (1) lack of suitable drainage con- 

 nection between the wet, flat areas and the drainage channels, and (2) the 

 inability of the drainage channels to remove the water after it has reached 

 them. The predominating and most generally cultivated type of soil of the 

 district is a light sandy loam underlain by a reddish to yellow clay at depths 

 of 4 to 18 in. Other soils are a tenacious gray clay, a red clay, and a heavy 

 black muck. 



The complete plan recommended for reclaiming the lands of the district 

 involves the construction of 68 miles of dredged ditches and 08 miles of hand- 

 made ditches. The minimum dredged ditch is one with a 14-ft. bottom width. 



