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- Spectrum analysis9
- Scientific illustration6
- Scientific apparatus and instruments3
- Sun3
- Astronomy2
- Stars--Spectra2
- Absorption spectra1
- Alkalies1
- Barium--Spectra1
- Blood--Analysis1
- Chemistry1
- College presidents1
- Deep space--Andromeda Galaxy1
- Hydrogen--Spectra1
- Laboratories--Equipment and supplies1
- Light--Study and teaching1
- Morton, Henry, 1836-19021
- Nebulae1
- Nebulae--Spectra1
- Photometry1