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He would study geology in the field, and took Saussure in his trunk he would note meteorology: he made a cyanometer—a scale of blue to measure the depth of tone, the colour whether of Rhine-water or of Alpine skies.

Thermometer 21; hygrometer 39.3; cyanometer 16 degrees.

This intensity, measured with the cyanometer of Saussure, was found from November to January generally 18, never above 20 degrees.

It corresponded only to 12 degrees of the cyanometer.

Its intensity at the zenith appeared to correspond to 41 degrees of the cyanometer.