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Triply ditkrential cross sections in coplanar geometry for the ionization of alomic hydrogen by electron impact have been measured and calculated at incident electron energies of 54.4, 27.2, 17.6 and 15.6 eV. The theory is the same as that used successfirlly at higher energies arid is shown to repioduce nearly all features of the CTOS sections in this low-energy regime as well. Moreovcr, the physical origin of peaks and dips in the triply differential cross sections has been explained. We conclude that kinematical effects, exdiarige effects, correlation and the coherence between electron-electron and electron-proton scattering are all important at t h e e enerejes.

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