30 
THE NATURALISTS’ BUREAU. 
20. HARBIS,—Rudimentary Magnetism, being a concise 
exposition of the General Principles of Magnetical Science 
and the Purposes to which it has been Applied. By Sir 
W. Snow Harris. 2nd edition, revised and enlarged by 
H. M. Noad. 12rao, cloth. Ill. London, 1872 . . . 1 80 
27. HIGGS.—The Electric Light in its Practical Appli¬ 
cations. By Paget Higgs, LL.D. 8vo, cloth, illustrated. 
London, 1879 . 3 50 
28. HIMES.—(Prof. C. P.) The Stereoscope. 8vo, pa¬ 
per, illustrated. Phila., 1872 . 50 
29. HOFFMAN.—Manual of Chemical Analysis $s Ap¬ 
plied to the Examination of Medicinal Chemicals : A Guide 
for the Determination of their Identity and Quality, and 
for the* Detection of Impurities and Adulterations. By 
Frederick Hoffman, Ph. D. 8vo, cloth, illustrated. New 
York, 1873 . 3 00 
30. JENKINS.—Electricity and Magnetism. By Flem¬ 
ming Jenkins. 12mo, cloth. London, 1873 . . . 1 50 
31. LANKESTER.—Half Hours with the Microscope. 
By E. M. D. Lankester. 16mo, cloth, 
gilt. Colored plates . . . . 2 00 
32. “ On Food ; being Lectures delivered 
at the South Kensington Museum. By E. L. Lankester, 
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33. LOCKYER.—Contributions to Solar Physics. By 
J. N. Lockyer. Royal 8vo, cloth. London, 1874 . . 7 50 
34. PLYMPTON.—The Blowpipe. A Guide to its use in 
the Determination of Salts and Minerals. Compiled from 
various sources by Prof. Geo. W. Plympton, A. M. 12mo, 
flexible cloth. New York, 1874 . 1 50 
35. ROSCOE.—Lessons in Elementary Chemistry, In¬ 
organic and Organic. By Henry Roscoe, B. A. New 
edition, revised by the author. London, 1878 . . . 1 50 
30. ROSCOE.—Spectrum Analysis. Six Lectures delivered 
in 1868 before the Society of Apothecaries of London. By 
Henry E. Roscoe, with Appendixes, colored plates and Il¬ 
lustrations. 3rd edition. 1 vol., royal 8vo, cloth. London, 
1872 . 9 00 
37. SOMERVILLE. —On.the Conversion of the Physi¬ 
cal Sciences. By Mary Somerville. 9th edition, re¬ 
vised. 1vol., 12mo, cloth. London, 1858 . . . . 4 50 
38. TYNDALL. —Sound: a Course of Eight Lectures deliv¬ 
ered at the Royal Institution of Great Britain. By John 
Tyndall, LL.D., F. R. S. 1 vol., 12mo, cloth. New York, 
1877 .. 2 00 
