of a second, the time required in ordinary cases for the remaining act of willing was easily calculated to be about one twenty-eighth of a second. If these investigations can be regarded as entirely trustworthy, they tend to show that the mind perceives somewhat more slowly than it wills.
Of the personal equation, in its widest sense, there are many examples even more suggestive and worthy of extended treatment than these which have received mathematical measurement. These examples are to be found in all human action, and in the result of all human work. Noticeably is this true in all acts and occupations which have their basis and lowest forms in acts of imitation. None the less is it true in those higher forms of art and action where close imitation is less desired than the interpretation of some pervading spirit, or the representation of some underlying essential. In the acts of painting a landscape, of copying a picture, of interpreting a symphony, of reading a poem, of acting a play, of following an argument, or in any of the common or artistic acts of men, be they mental or physical, the personal equation of the actor enters as a perceptible element in the result. The discussion of the nature and value of the personal equation where it appears in forms so subtile as in the cases last mentioned would furnish many considerations of interest and instruction, but to undertake the treatment of these forms is beyond our present purpose or opportunity.
| ABORIGINAL POTTERY OF THE SALT-SPRINGS, ILLINOIS. |
By GEORGE ESCOL SELLERS.
IN the work by the late J. W. Foster, LL.D., on the "Prehistoric Races of the United States of America," published in 1873, when treating of the pottery of the mound-builders, on page 248, he says:
