SCIENTIFIC PUBLICATIONS. 21 



HOWARD, C. R. Earthwork Mensuration on the Basis 



of the Prismoidal Formulae. Containing Simple and Labor-saving 

 Method of obtaining Prismoidal Contents directly from End Areas. 

 Illustrated by Examples and accompanied by Plain Rules for Practi- 

 cal Uses. Illustrated. 8vo, cloth $1.50 



HO WORTH, J. Art of Repairing and Riveting Glass, 



China and Earthenware. Second edition. 8vo, pamphlet, illus- 

 trated net, $0.50 



HUBBARD, ERNST. The Utilization of Wood- 

 Waste : a Complete Account of the Most Advantageous Methods of 

 Working Up Wood Refuse, especially Sawdust, Exhausted Dye 

 Woods and Tan as Fuel, as a Source of Chemical Products for Arti- 

 ficial Wood Compositions, Explosives, Manures, and many other Tech- 

 nical Purposes. Translated from the German of the Second revised 

 and enlarged edition. 8vo, cloth, illustrated, 192 pages. . .net. $2.50 



HUMBER, WILLIAM, C. E. A Handy Book for the 



Calculation of Strains in Girders, and Similar Structures, and their 

 Strength ; Consisting of Formulae and Corresponding Diagrams, with 

 numerous details for practical application, etc. Fourth Edition. 

 12mo, cloth $2.50 



HURST, GEO. H., F. C. S. Color; a Hand-book of 



the Theory of Color. A practical work for the Artist, Art Student, 

 Painter, Dyer and Calico Printer and Others. Illustrated with 10 

 colored plates and 72 illustrations. 8vo, cloth net, 82.50 



- Dictionary of Chemicals and Raw Products used 



in the Manufacture of Paints, Colors, Varnishes and Allied Prepara- 

 tions. 8vo, cloth net, $3.00 



- Lubricating Oils, Fats and Greases ; Their Origin, 



Preparation, Properties, Uses and Analysis. 313 pages, with 65 illus- 

 trations. 8vo, cloth net, $3.00 



Soaps; A Practical Manual of the Manufacture of 



Domestic, Toilet and other Soaps. Illustrated with 66 Engravings. 

 8vo, cloth net, $5.00 



HUTCHINSON, W. B. Member of the New York Bar. 

 Patents and How to Make Money out of Them. 12mo, cloth. ..$1.25 



HUTTON, W. S. Steam Boiler Construction. A Prac- 

 tical Hand Book for Engineers, Boiler Makers and Steam Users. 

 Containing a large collection of rules and data relating to r nt 

 practice in the design, construction, and working of all kinds of 

 stationary, locomotive and marine steam-boilers. With upwards of 

 640 illustrations. Fourth Edition, run j'nfti/ r> vim d and much en- 

 larged. 8vo, cloth $6.00 



- Practical Engineer's Hand-Book, Comprising a 

 treatise on Modern Engines and Boilers, Marine, Locomotive and 

 Stationary, fourth I'.dltion. Carefully revised with addition*. 

 With upwards of 570 illustrations. 8vo, cloth $7.00 



