152 



THE THERMOMETER. 



especially when these are fringed with cold 

 sierras, which condense the vapour and render 

 the interior a lee land. 



In 1847 the Geographical Society of Bombay 

 sent a barometer to Zanzibar, and requested that 

 a meteorological register might be kept. Their 

 wishes were not immediately carried into effect ; 

 but after a time the Eurasian apothecary in 

 charge of the Consulate filled up in a rude way 

 during nine months a weather-book, with observa- 

 tions of the barometer, of two thermometers 

 attached and unattached, of wet and dry bulbs, 

 of evaporation and of rainfall. In the Journal 

 of the Hoyal Geographical Society (xxiii. of 

 1853), Colonel Sykes published a 'record, kept 

 during eleven months in 1850, of the indications 

 of several intertropical instruments at Zanzibar,' 

 unhappily without those of pressure. 1 



The result of nine months' observations is that 1 



1 The temperature of the island as observed by French 

 travellers is — 



Max. (April 6 a.m. 2 morn.) 89° (F.)— Colonel Sykes— 88° (F. in shade) 

 Min. (October, midnight and 6 a.m.) 73° ditto 73° 



Mean temperature of the year 79° 15 ditto 79'90 (extreme range 18°-19c) 



The following are the results of the evaporating dish : — 



Total of Greatest in one Least in 



month. day of month. one day. 



inches. inches. inches. 



January, 1857 ... . 2"36 .... 09 .... 004 



February „ .... 219 .... 010 .... 005 



March „ .... 2'49 .... 09 .... 006 



April „ .... 176 .... 010 .... 003 



