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The aqueous vapour is less perfectly dissolved; and here, as in our climates, a greater diffusion of light diminishes the intensity of the aerial colour, by introducing white into the blue of the air. This intensity, measured with the cyanometer of Saussure, was found from November to January generally 18, never above 20 degrees. On the coasts it was from 22 to 25 degrees.
I remarked, in the village of Caracas, that the wind of Petare sometimes contributes singularly to give a pale tint to the celestial vault. The wind ceased at three in the afternoon. Thermometer 21; hygrometer 39.3; cyanometer 16 degrees. The atmosphere was then remarkably transparent, without clouds, and of extraordinary dryness.
M. Labillardiere has seen it, on the edge of the crater of the peak of Teneriffe, at 18.7 degrees, though he had used every possible precaution to avoid the effect of accidental causes. On the summit of the Peak, we beheld with admiration the azure colour of the sky. Its intensity at the zenith appeared to correspond to 41 degrees of the cyanometer.
After the pleurisy of April, 1835, his parents took him abroad again, and he made great preparations to use the opportunity to the utmost. 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. He would sketch.
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