226 DOVE ON THE NON-PERIODIC VARIATIONS IN THE 
1807 to 1824. | 1797 to 1804. Difference. 
Madras of. tarive recone ses seomeee 29-03 22-4] + 0-18 
Puerto, Cat sks eee 13:37 13°81 + 0:44 
WVEt an: Senin ceeceasensccesrecanes 10:10 10°58 + 0-48 
Dinsprilck/-6-, saos->«becsdoeae 7:39 751 + 0:12 
MbUtiratdsesnoe dace cecbasteete 761 8°36 + 0-75 
Regensburg ........secccesees 6°52 7:26 + 0-74 
Berlin Mite ceasthcvedebseced 6°81 6:93 + 0:22 
TUONGON. sncetesesscbanccacecoee 7:56 8:12 + 0°56 
Salem's... ceccvedmencecssseees 7°25 776 + 0°41 
1820 to 1830, | 1828 to 1834. Difference. 
IVITLAT. tb ecavsecansemscaperoeert 10°36 9:95 — 0°41 
StI Berns ies.cstessttscses te — 0:82 — 0:80 + 0:02 
IF ENCVAR scccp snxctoavesiase eients te 7°39 + 0:37 
INIWNIGN eds scesesreceee ee eecnne 751 7°56 + 0-05 
Augsburg esos» 6°76 6:38 — 0:38 
Stuttgard ...... 7:83 7'47 — 0:36 
Regensburg .ssceccecesceeeess 6-84 6°80 — 0:04 
BSCE rencesasseestcuecvessst 7:46 7:08 — 0:38 
ARNIS Rs Sides th d¥asnats vontodece 8:73 8°67 — 0:07 
In these tables we observe so striking an agreement between 
the signs of the differences, that the foregoing conclusion appears 
fully justified. The exceptions, of which that of Geneva is the 
most marked, are probably owing to the disturbing influence of 
the Alps. 
In the next tables, the extent of the variation of temperature 
of each month, as deduced from the observations of many years, 
is exhibited. The places of observation are divided into groups 
according to their climate: this maximum of change may be 
called the absolute variability. The greatest variation of the 
yearly mean for each place is also shown. 
From the attentive examination of these tables we may con- 
clude : 
First, the absolute variability of temperature is least in the 
tropics, but more considerable in the region of the monsoons 
than in that of the trade winds. 
Secondly, in the temperate zone, particularly at places which 
have not a thorough sea climate, the absolute variability increases 
as we approach the frigid zone, as shown in the following com- 
parison. 
