Smithsonian miscellaneous collections . y the character proper to theseason of prevailing insolation whereas in the winter curve theinfluence of the cooling of the ground is very evident; the part played 10 See figs. 56 and 57 of Memoir XV. The Heat Exchange, Sitzungsbe-richte, Berlin, 1892. (See No. XIX of this collection of translations.) 11 Wissenschaftliche Luftfahrten, Vol. Ill, pp. 93-95. 12 Wissenschaftliche Luftfahrten, Vol. Ill, p. 166. 312 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 5I by the ground is also beautifully seen in the changes from winter tospring and from summer to autumn
Smithsonian miscellaneous collections . y the character proper to theseason of prevailing insolation whereas in the winter curve theinfluence of the cooling of the ground is very evident; the part played 10 See figs. 56 and 57 of Memoir XV. The Heat Exchange, Sitzungsbe-richte, Berlin, 1892. (See No. XIX of this collection of translations.) 11 Wissenschaftliche Luftfahrten, Vol. Ill, pp. 93-95. 12 Wissenschaftliche Luftfahrten, Vol. Ill, p. 166. 312 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 5I by the ground is also beautifully seen in the changes from winter tospring and from summer to autumn. It is also evident that especially in the summer curve between3000 and 4000 meters peculiarities may be recognized similar tothose in the lowest thousand meters, although on a much feeblerscale. Perhaps we may in this perceive an indication of the circum-stance that similar, although perhaps feebler, processes take placeat the upper boundarv surface of thick clouds as at the surface ofthe earth. 6000m -IO o to- \ ^ \ l\ W FH SFIG. 44. The curves in fig. 45 representing the change of the specifichumidity show great similarity to the temperature curves, as indeedcould but be expected. The irregularities shown by them are notsurprising. We would rather wonder that the curves are not stillmore irregular when we consider the difficulties that we encounter indetermining the humidity and how small are the psychrometricdifferences in the upper strata on which these determinations arebased. We may therefore rather regard these curves as a welcomeproof of the excellence of the observations. Reference has already been made to the fact that the curvesof temperature condition here used have great similarity to thosethat I have previously used in order to study the movements ofheat in the ground and which can be equally well applied to thecorresponding processes in lakes or the ocean. In that memoir13 I have drawn the depths vertically downwardfrom the earths surface as ordinates and the c
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