Underdrains, 35, 39. bacteria from, 87. friction of, at Albany, 299. size of, 41. ventilators for, 44. Uniformity coefficient of sand, 21, 238. Ventilators for underdrains, 44. Vienna, water-supply of, from springs, 276. Warren filter, 151, 161, 162, 172, 176, 177. Warsaw, filters at, 275. friction in underdrains, 43. regulation of rate at, 57. Wasting effluents, 74. Water, depth of, on filters, 45, 59. heating of, in filters, 45. organic matters in, 83. Water-supplies of American cities, 211. Water-supply and disease, 210. Waters, what require filtration, 207. Weston, E. B., 153, 154, 159. Weston, R. S., 153, 189. West Superior, iron in ground-water at, 189. Winter, effect of, upon filtration, 12. temperatures of places having open and covered filters, 15. Worms tile system, 181. Zürich, filters at, 274. SHORT-TITLE CATALOGUE OF THE PUBLICATIONS OF JOHN WILEY & SONS, NEW YORK. LONDON: CHAPMAN & HALL, LIMITED. ARRANGED UNDER SUBJECTS. Descriptive circulars sent on application. Books marked with an asterisk (*) are sold at _net_ prices only, a double asterisk (**) books sold under the rules of the American Publishers’ Association at _net_ prices subject to an extra charge for postage. All books are bound in cloth unless otherwise stated. AGRICULTURE. Armsby’s Manual of Cattle-feeding 12mo, $1 75 Principles of Animal Nutrition 8vo, 4 00 Budd and Hansen’s American Horticultural Manual: Part I. Propagation, Culture, and Improvement 12mo, 1 50 Part II. Systematic Pomology 12mo, 1 50 Downing’s Fruits and Fruit-trees of America 8vo, 5 00 Elliott’s Engineering for Land Drainage 12mo, 1 50 Practical Farm Drainage 12mo, 1 00 Green’s Principles of American Forestry 12mo, 1 50 Grotenfelt’s Principles of Modern Dairy Practice. (Woll.) 12mo, 2 00 Kemp’s Landscape Gardening 12mo, 2 50 Maynard’s Landscape Gardening as Applied to Home Decoration 12mo, 1 50 * McKay and Larsen’s Principles and Practice of Butter-making 8vo, 1 50 Sanderson’s Insects Injurious to Staple Crops 12mo, 1 50 Insects Injurious to Garden Crops. (In preparation.) Insects Injuring Fruits. (In preparation.) Stockbridge’s Rocks and Soils 8vo, 2 50 Winton’s Microscopy of Vegetable Foods 8vo, 7 50 Woll’s Handbook for Farmers and Dairymen 16mo, 1 50 ARCHITECTURE.