1917] RURAL ENGINEERING. 281 



"Although the full significance of the presence of merozoites and of other 

 stages of Eimeria avium in subepithelial regions of the intestines can not yet 

 be grasped, their frequency of occurrence there and their freedom from all 

 appearances of degenerative changes lead us to assume that this phenomenon 

 marks an ordinary phase of the normal infective process ; and that so far as 

 the coccidia are concerned, we must, as the writer pointed out some years ago, 

 abandon the view that they are exclusive parasites of epithelial cells in the 

 sense that they must occupy epithelial cells to complete their normal develop- 

 ment." 



Another case of the occurrence of the giant nematode, Dioctophyme 

 renale, in the abdominal cavity, and data bearing upon the theory of entry 

 via the genito-urinary tract, W. A. Riley (Coriiell Vet., 7 (19111), No. 1. pp. 

 J^S-lfS). — The data here presented supplement the account previously noted 

 (E. S. R., 36, p. 86). 



RUEAL ENGINEERING. 



Proceedings of the second, third, and fourth annual meetings of the 

 Washington Irrigation Institution, December, 1914, January, 1916, and 

 November, 1916 {Proc. Wash. Irrig. Inst., 2 (1914), pp. 16S, fig. 1; S (1916), 

 pp. 21 Jf, fig. 1; // (1916), pp. 1^1, figs. 3). — These proceedings contain, respec- 

 tively, the, following special articles bearing on irrigation engineering: 



Second meeting. — Experience with Canal Lining, by E. M. Chandler; Canal 

 Lining Experience, by J. G. Heinz; Plant Growth In Canals, by F. C. Lee; 

 Methods of Water Delivery, Rotation, and Size of Head, by M. Chase; Oper- 

 ation of the State Drainage Law, by W. B. Bridgman and J. O. Greenway ; The 

 Use of Electric Power in Pumping Water for Irrigation, by H. D. Hanford; 

 Discussion of Drainage and Reclamation of Alkali Land, by H. E. Nicolai; 

 Hydrated Lime in Irrigation Work, by C. D. Smith ; Economy, Durability, and 

 Efficiency of Water Distribution Systems, by A. B. Fosseen ; Vitrified Clay 

 Pipe for Irrigation and Drainage, by W. M. Watt ; Irrigation District Laws, by 

 C. B. Graves ; The State College and Irrigation, by E. A. Bryan ; The Farmer's 

 Part in Irrigation Development, by S. Fortier ; The Use of Metallic Flumes 

 and Pipes in Irrigation Development, by G. L. Hess ; and Duty of Water, by 

 S. O. Jayne. Articles on Plaster Concx'ete Lining for Canals and Laterals, by 

 O. Casteel ; and Experience with Wood Stave, Concrete, and Steel Pipe, by 

 E. M. Chandler, are appended. 



Third meeting. — Irrigation Conditions, by E. F. Benson; Maintenance and 

 Construction of Metal Flumes, by W. B. Armstrong ; Uses of Concrete in Irriga- 

 tion Development, by C. N. Reitze; Irrigation Pumping by Means of Electric 

 Pumping, by G. Longmuir ; Irrigation Pumping, Other Methods, by S. B. Hill ; 

 Wood Pipe, Its Uses and Limitations, by T. A. Noble ; and Conflicting Interests 

 in Water Legislation, by W. F. Allison. Descriptions of irrigation projects in 

 the State are included. 



Fourth meeting. — Method and Time of Applying Water, by O. L. Waller; 

 Wood and Thin Metal Pipe, by T. A. Noble ; Light Iron Pipes, by C. Casteel ; 

 The Value of Irrigation to the State, by M. Chase; Metal Flumes, by W. B. 

 Armstrong; Metal Flumes as Canal Lining, by E. M. Chandler; The Agricul- 

 tural Duty of Water, by J. C. Wheelon; Drainage, by G. Severance; Wooden 

 Flumes, by W. F. Allison ; Oil-Burning Engines, by J. B. Frem ; and Cement 

 Lining of Canals, by C. Casteel. 



Flow through submerged rectangular orifices with modifl.ed contractions, 

 V. M. Cone (U. S. Dept. Agr., Jour. Agr. Research, 9 (1917), No. 4, pp. 97-114, 

 figs. 13). — Experiments conducted at the Colorado Experiment Station in 



