CONTENTS 



PAGE 



PREFACE v 



ADDRESS BY DR. T. C. MENDENHALL 1 



SCIENTIFIC PAPERS 19 



PART I. EAKLY PAPERS. 21 



*1. The Vortex Problem 23 



Scientific American XIII, 308, 1865. 



2. Paine's Electro-magnetic Engine 24 



Scientific American XXV, 21, 1871. 



3. Illustration of Resonances and Actions of a Similar Nature 28 



Journal of the Franklin Institute XCIV, 275-278, 1872. 



4. On the Auroral Spectrum 31 



American Journal of Science (3), V, 320, 1873. 



PART II. MAGNETISM AND ELECTRICITY. 33 



5. On Magnetic Permeability, and the Maximum of Magnetism of Iron, 



Steel and Nickel 35 



Philosophical Magazine (4), XL VI, 140-159, 1873. 



6. On the Magnetic Permeability and Maximum of Magnetism of Nickel 



and Cobalt 56 



Philosophical Magazine (4), XLVHI, 321-340, 1874. 



7. On a new Diamagnetic Attachment to the Lantern, with a Note on 



the Theory of the Oscillations of Inductively Magnetized Bodies.. 75 

 American Journal of Science (3), IX, 357-361, 1875. 



8. Notes on Magnetic Distribution 80 



Proceedings of the American Academy of Arts and Sciences, XI, 191, 192, 

 1876. 



9. Note on Kohlrausch's Determination of the Absolute Value of the 



Siemens Mercury Unit of Electrical Resistance 82 



Philosophical Magazine (4), L, 161-163, 1875. 



10. Preliminary Note on a Magnetic Proof Plane 85 



American Journal of Science (3), X, 14-17, 1875. 



* The numbers refer to corresponding ones in the Bibliography, page 681. 



