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Number of Oscillations in a Musical l~ote.--Pfaundler coneluded, fi,om obserwttions with a siren, that two oseillations were sufficient to produce "~ note. Felix Auerbaeh, from a combination of physiological, psychologieal, physical and musi(~d considerations, finds that probably about twenty oscillations arc necessary. His views are confirmed by previous observations of Exner, Von Kries and Toepler.--Anat. der Phys. ~ml (?t,~m. C.
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## Photo-Electricity. 273 Photo-Electricity.--The marked influence of sunlight on the electric conductivity of selenium, led Biirnstein to experiment with other metals. He concluded that all bodies were affected by photoelectricity, but G. Hausemann, at the suggestion of Dr. Werner Siemens, entere
Estimating upper bounds of the spectrum of large Hermitian matrices has long been a problem with both theoretical and practical significance. Algorithms that can compute tight upper bounds with minimum computational cost will have applications in a variety of areas. We present a practical algorithm