Absolute cross sections are reported for the production of the nuclides ${\mathrm{Co}}^{58}$, ${\mathrm{Co}}^{56}$, ${\mathrm{Co}}^{55}$, ${\mathrm{Fe}}^{52}$, ${\mathrm{Mn}}^{56}$, ${\mathrm{Mn}}^{52}$, ${\mathrm{Mn}}^{51}$, ${\mathrm{Cl}}^{39}$, and ${\mathrm{Cl}}^{38,34}$ from bombardment of ${\mathrm{Co}}^{59}$ with protons of energies 60, 100, 170, and 240 Mev. The yields appear to be accounted for at the lower energies by a combination of compound nucleus model, knock-on cascade model and for the production of chlorine isotopes a fission mechanism. A knock-on cascade model together with a fission mechanism may be used to explain the yields at the higher energies.

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