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HORSFORD, E. N. Report on an Investigation of the Sources of the 

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 the Hog-Slaughtering Establishment of John P. Squire & Co., 

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Scientific Researches. Vol. VI M Pamphlets. Octavo series. 



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The Permeability of Metals to Mercury. Vol. xxvm., Pam- 

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HOSKOLD, H. D. A Practical Treatise on Mining, Land and Rail- 

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8vo. 249 pp. London, 1863. 



HOUGH, Franklyn B. Census of the State of New-York for 1865. 

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4to. 473 pp. Albany, 1867. 

 How, Henry. The Mineralogy of Nova Scotia. 



8vo. 217pp. Halifax, 1869. 

 How You Waste Your Fuel and How to Prevent It. A Few Facts 



011 Combustion. Vol. XVI., Pamphlets. Octavo series. 



8vo. 12 pp. Worcester, 1866. 



HUBBARD, Prof. See under Washington Astronomical and Meteo- 

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 HUBBE, H. Reisebemerkungen, hydrotechnischen Inhalts. 



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HUBERT, Alois von. Auleitung durch Colorimetrie den Kupper- 

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8vo. 58 pp. Vienna, 1852. 



HUET, A. See Exposition Universelle de Paris, en 1867. 

 HUGHES, G. W. Report relative to the working of Copper ore. 



Vol. VII., Pamphlets. Octavo series. 8VO. 58pp. Washington, 1844. 



Samuel. A Treatise on Gas Works. 



Svo. 336 pp. London, 1866. 

 HUGO, Leopold. Essai sur le Geometric des Cristalloides. 



8vo. 16 pp. Paiis, 1873. 



Introduction a la Geometric Descriptive. Des Cristalloides, 



Vol. I., Pamphlets. Octavo series. 



Svo. 19 pp., III. plates. Paris, 1874. 



Les Cristalloides a Directrice Cireulaire. 



Svo. 40 pp., I. plate. Paris, 1867. 



Les Cristalloides Complexes a Summit Etoile. Vol. L, Pam- 

 phlets, octavo series. 8vo. 24 pp., III. plates. Paris, 1872. 



Theorie des Cristalloides Elementaires. 



Svo. 58 pp., IV. plates. Paris, 1867. 



HUMBER, William. A Handy Book for the Calculation of Strains 

 in Girders. 12mo. 71 pp. London, 1868. 



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HUMBOLDT, Alexander von. Atlas Geographique et Physique du 

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