A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 266
minous pointstoward the centre, indicating probably that the real formis that of a globe. Some of the clusters when viewedthrough powerful telescopes assume a much more irregularappearance, although their general form still appears tobe spherical. Very irregular clusters are rare. a. Examples.—A… … 262 THE STARS.
Astronomy
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