 Other areas included the compressibility of liquids, the critical point of gases,specific heats, hygrometry, and the measurement of indices of refraction of gases, liquid water at different pressures, and of water vapor.In addition to the elliptical polarization of glassy substances, he discovered the negative elliptical polarization of flourine.While he was a professor in Caen he would take his pupils on botanical and geologically focused expeditions on Sundays.