[en] Recent measurements by Israel et al. and Webber have indicated that the silicon-to-iron ratio in the galactic cosmic radiation increases rapidly with decreasing energy over the range approx.0.4 to 1 GeV per nucleon. Measurements made with the University of Chicago instrumentation on satellites and high altitude balloons over the energy range 35 MeV to 4 GeV per nucleon do not support this results. The measurements reported here leave only a small gap in the range of the Israel et al. and Webber measurements, therefore restricting a large variation of the Si/Fe ratio to a narrow energy range. Our data show little variation in the Si/Fe ratio below 1 GeV per nucleon, and are consistent with energy independence over this energy range. Energy spectra for Si and Fe are presented, and the corresponding local interstellar spectra are calculated using a standard model of solar modulation. It is found that the local interstellar spectra can be fitted by current models of galactic propagation