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A Question of Priorities: Forbes, Agassiz, and Their Disputes on Glacier Observations

THIS PAPER CONCERNS A CONTROVERSY about priorities between J. D. Forbes, Professor of Natural Philosophy at the University of Edinburgh, and the noted Swiss scientist Louis Agassiz, later to be a distinguished teacher at Harvard. Its origins lie in the visit which Forbes made at Agassiz' invitation to the Unteraar glacier in Switzerland, in the summer of 1841, during which a major topic of interest was their observations of the bandes bleues, markings in the ice previously little discussed. Both men, in independent later publications, were to establish the importance of the bandes in the theory of glacial ice and its movement. The question of credit for the discovery, and priority in its publication, was unclear at the time and has remained so despite bitter debate. Examination of surviving papers in Great Britain and in Switzerland suggests that previous discussions have not closed the question,' and our purpose is to review the evidence and if possible to clarify the issue.