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- A method for determining the orbital elements of a spectroscopic binary, with application to γ Geminorum
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- On a method based on a property of central projection for reducing the rectangular coordinates measured on an arbitray plate to those of any other plate
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- Corrections to a number of P.G.C. stars derived from differential observations with the meridian circle at Leiden
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- Some problems concerning the distribution of luminosities and peculiar velocities of extragalactic nebulae
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- The resistance experienced by the outward moving chromospheric Ca<SUP>+</SUP> ions and its effect on the density
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- Determination of absolute declinations and latitude by observations at the meridian circle and the zenith telescope