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Vol. 11. Part 1. Centennial Celebration. 1880. pp. 1-104. 1882. $2.00. 



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June, 1885. (Author's copies, June, 1883.) $3.00. 

 Part 3. Nos. 2-3. Searle, A.^The Apparent Position of the Zodiacal Light, pp. 135-157, 



and Chandler, S. C. — On the Square Bar Micrometer, pp. 158-178. October, 1885. 



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 Part 4. No. 4. Pickering, E. C. — Stellar Photography, pp. 179-226. 2 pis. March, 



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 Part 4. No. 5. Rogers, W. A., and Winlock, Anna. — A Catalogue of 130 Polar Stars 



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2. Rowland, H. A. — On a Table of Standard Wave Lengths of the Spectral Lines, pp. 

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3. Thaxter, R. — Contribution towards a Monograph of the Laboulbeniacese. pp. 187- 

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4. Lowell, P. — New observations of the Planet Mercury, pp. 431-466. 8 pis. June, 

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5. Sedgwick, W. T., and Winslow, C. E. A. — (I.) Experiments on the Effect of Freezing 

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Vol. 13. 1. Curtiss, D. R. — Rinary Families in a Triply connected Region with Especial 

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3. Lyman, T. — The Spectrum of Hydrogen in the Region of Extremely Short Wave-Length. 

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5. Trowbridge, J. — High Electro-motive Force, pp. 181-215. pis. xxv-xxvii. May, 

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6. Thaxter, R.^ Contribution toward a Monograph of the Laboulbeniacese. Part II. 

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