. Tropical nature, and other essays . d close to the equator, agree how-ever very closely with those at Batavia ; but at thelatter place all the observations were made withextreme care and with the best instruments, and aretherefore preferred as being thoroughly trustworthy.^The accompanying diagram, showing by curves themonthly means of the highest and lowest daily tempera-tures at Batavia and London, is very instructive ; moreespecially when we consider that the maximum oftemperature is by no means remarkably different in thetwo places, 90° Fahr. being sometimes reached with usand not being
. Tropical nature, and other essays . d close to the equator, agree how-ever very closely with those at Batavia ; but at thelatter place all the observations were made withextreme care and with the best instruments, and aretherefore preferred as being thoroughly trustworthy.^The accompanying diagram, showing by curves themonthly means of the highest and lowest daily tempera-tures at Batavia and London, is very instructive ; moreespecially when we consider that the maximum oftemperature is by no means remarkably different in thetwo places, 90° Fahr. being sometimes reached with usand not being often very much exceeded at Batavia. 1 Observations Made at the Magnetical and Meteorological Observatoryat Batavia. Published by order of the Government of Netherlands I. Meteorological, from Jan. 1866 to Dec. 1868 ; and Magnetical, fromJuly 1867 to June 1870. By Dr. P. A. Bergsma. Batavia, 1871. Thisfine work is entirely in English. TEMPEHATURE AT BATAYIA AND LONDON. 5 Mordh^ Meai% Temperatare al EaiaVLOy &Iondx) 6 TROPICAL NATURE, AND OTHER ESSAYS. Causes of the Uniform High Temperature near theEquator.—It is popularly supposed that the uniformhigh temperature of the tropics is sufficiently explainedby the greater altitude, and therefore greater heating-power, of the midday sun ; but a little consideration willshow that this alone by no means accounts for thephenomenon. The island of Java is situated in fromsix and a half to eio-lit and a half deOTees of southlatitude, and in the month of June the suns altitudeat noon will not be more than from 58° to 60°. In thesame month at London, which is fifty-two and a halfdegrees of north latitude, the suns noonday altitude is 62°.But besides this difference of altitude in favour of Londonthere is a still more important difference ; for in Java theday is only about eleven and a half hours long in the monthof June, while afc London it is sixteen hours long, so thatthe total amount of sun-heat received by the earth
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