Parents

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Reinhard Joh. Blum research assistant 1872-1873 Universität Heidelberg (Chemistry Tree)
Robert Wilhelm Eberhard Bunsen research assistant 1872-1873 Universität Heidelberg (Chemistry Tree)
Gustav Robert Kirchhoff research assistant 1872-1873 Universität Heidelberg (Physics Tree)
Carl Klein research assistant 1872-1873 Universität Heidelberg (Physics Tree)
Gustav Tschermak research assistant 1873-1874 Universität Wien
George Jarvis Brush grad student 1876 Yale
 (Trap Rocks of the Connecticut Valley)

Children

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Arthur Louis Day grad student 1894 Yale

Collaborators

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William Gilbert Mixter collaborator 1872 Universität Heidelberg (Chemistry Tree)
 (collaborated in Bunsen's lab in Heidelberg)