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Spectra (9): August 11, 187-

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Spectra (8): August 12, 1873

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Spectra (5) - No. 2: 12 January 1876

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Cyanogen (15): 23 April 1876

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Spectra (16): 19 June 1876

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Print of solar spectrum-"Discovery of oxygen in the sun" (2): 1876-

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Sun and Air (Leyden spark) with coincidence of oxygen lines with "bright lines" in the sun (7): 1876

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Spectrum of CO2-Voighander between slit of plage-Browning prism close to slit (9): February 1877

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Hydrogen 800 ten? sparks per minute-Browning of prisms (17): 14 February 1877

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Hydrogen-800 ten inch sparks per minute-10m ex.- Browning of prism (25): 14 February 1877

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Sun 5S Nitrogen 800 ten inch sparks per minute: 17 February 1877

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Solar spectrum with comparison (41): 18 February 1877

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Hydrogen 15m ex. 800 sparks per minute-No Leyden-No. 2 (22): 1 March 1877

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Hydrogen-No Leyden-15m ex...No.3 (23): 1 March 1877

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Hydrogen-No Leyden (21): 3 March 1877

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Hydrogen 2nd ex. of tube 10m-800 sparks red-No. Leyden: 18 March 1877

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Solar spectrum with comparison identification (40): 24 March 1877

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Leyden (11): 24 March 1877

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Solar spectrum with nitrogen lab spectrum for comparison (34): 1 April 1877

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Solar spectrum with CO2 (43): 3 April 1877

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Solar spectrum with air for comparison (38): 7 April 1877

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Solar spectrum with nitrogen laboratory spectrum (31): 11 April 1877

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Solar spectrum with comparison CO2 identifications (37): 15 April 1877

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Solar spectrum with comparison spectrum (28): 15 April 1877

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