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Updated: June 11, 2025
It is not possible that the habits of vegetables, grown in countries where irrigation has been immemorially employed, have been so changed that they require water under conditions of soil and climate where their congeners, which have not been thus indulgently treated, do not It is a remarkable fact that during the season of irrigation, when large tracts of surface are almost constantly saturated with water, there is an extraordinary dryness in the atmosphere of Lombardy, the hygrometer standing for days together a few degrees only above zero, while in winter the instrument indicates extreme humidity of the air, approaching to total saturation.
The sunrise was very fine, through an arch 10 degrees high of bright blue sky, above which the whole firmament was mottled with cirrus. It continued cloudy, with light winds, througbout the day, but clear on the horizon. From this tinge such storms became frequent, ushering in the equinox; and the less hazy sky and rising hygrometer predicted an accession of moisture in the atmosphere.
The young aeronauts thus had all afternoon to store provisions, water, gasoline and the instruments. The altitude barometer, the recording thermometer, the statoscope and recording hygrometer, together with the telescopic camera were each given a place on the bridge and lashed to the netting.
The hygrometer marked a maximum of humidity experienced, namely, seventy-seven at three thousand seven hundred and seventy feet, and the balloon was then at four thousand six hundred feet, where the humidity was only seventy-three. It is therefore certain that this is a phenomenon of the diffraction of light simply produced by the vesicles of the mist.
The same cause which checks the diffusion of the solar light, diminishes the extinction of that which emanates either from bolides from Jupiter, or from the moon, seen on the second day after its conjunction. The 12th of November was an extremely hot day, and the hygrometer indicated a very considerable degree of dryness for those climates.
When the reddish vapour spreads lightly over the sky, the great stars, which in general, at Cumana, scarcely scintillate below 20 or 25 degrees, did not retain even at the zenith, their steady and planetary light. I have often seen at Cumana a great scintillation of the stars of Orion and Sagittarius, when Saussure's hygrometer was at 85 degrees.
The barometer would be an absolutely reliable guide for the hunting man were it not for the complications already named above, complications which prevent either barometer or hygrometer from offering infallible indications of good or bad scenting days.
And Boettger has stated that ozone is formed when ether is atomized; the fact being that the reaction he observed was due to the H2O2 always present in ether. Direct experiments with the Schoenbein ozonometer and the psychrometer gave parallel curves; whence the author regards the former as only a crude hygrometer.
The mean annual temperature of the valleys of Aragua is nearly 25.5 degrees; my hygrometrical observations of the month of February, taking the mean of day and night, gave 71.4 degrees of the hair hygrometer.
It so happened that for some years the present writer had also been amusing himself with experiments of the same nature, and at one time entertained the hope that by means of the hygrometer he would arrive at a solution of the mystery. But alas! it was not to be. On several occasions when the air was well-nigh saturated, scent proved abominable.
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