The people
came to these excursions by hundreds, and all classes were represented
in them--physicians, apothecaries, preachers, merchants, and mechanics,
all joined the procession, which left the university at seven in the
morning, to return at eve laden with zoological, botanical, and
mineralogical specimens.
A man who could thus arouse popular enthusiasm for science a century and
a half ago must have been a remarkable genius. Trusted students of
Linnaeus were sent on botanical exploring expeditions throughout the
world. The high renown in which Linnaeus was held was shown in the
significant title, almost universally bestowed upon him, of "The Flower
King."--_Western Druggist._
* * * * *
ON A METHOD OF MAKING THE WAVE LENGTH OF SODIUM LIGHT THE ACTUAL AND
PRACTICAL STANDARD OF LENGTH.
BY ALBERT A. MICHELSON AND EDWARD W. MORLEY.
The first actual attempt to make the wave length of sodium light a
standard of length was made by Peirce.[1] This method involves two
distinct measurements: first, that of the angular displacement of the
image of a slit by a diffraction grating, and, second, that of the
distance between the lines of the grating. Both of these are subject to
errors due to changes of temperature and to instrumental errors.
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