1837.] Account of the New Colony of Western Australia. 325 



ly a little quicker in its motions, which occasioned it being found 

 a degree or a degree and a half higher in summer and as much 

 lower in winter, than the quicksilver in the larger thermometer. The 

 difference between the heat of the air warmed by the direct rays 

 of the sun, and that within doors was on an average 18 degrees ; when- 

 ever it was remarkably greater, notice will be taken of it. The obser- 

 vations were made at 7 a. m., 2 p. m. and 7 p. m. The highest degree of 

 heat generally occurred at 2 p. m., soon after which period, the sea 

 breeze had fully set in at Perth, and the thermometer commenced to 

 descend. The height of the thermometer at a medium is calculated 

 from its average height at these different hours. The barometer was 

 included in the same case with the thermometer, the whole made by 

 Cary of London. It was occasionally heard that the barometer rose a 

 little before wet weather, but this was an exception to the general rule. 

 I regret the want of an hygrometer prevented upon me from ascertain- 

 ing the exact dryness or humidity of the atmosphere ; but this deficiency 

 is in some measure supplied by the number of rainy days being noted, 

 as well as by extracts from the register of the pluviameter kept by my 

 friend A. Colin, Esq. Colonial Surgeon at Garden Island and Perth— 

 for which see Table at the end. 



1830, Marc h. —Was fine for the most part, a little rain fell on the 

 11th, also on the 24th, at new moon ; heavy rains on the 1 8th, light- 

 ning and thunder on 31st ; prevalent winds E. — N. and N. E. 



Max. Med. Min. 



Thermometer 88 731 58 



Barometer 30.30 30.05 29.80 



April. — Early part cloudy and showery, middle fine, latter end cloudy; 

 showers fell on 1st, 4th, 5th, 6th, 7th, 16th, 24th, 27th and 30th ; 

 lightning and thunder on 16th, 22d, 24th and 27th; winds N. W.— S. W. 

 and N. E. 



Max. Med. Min. 



Thermometer 87 681 54 



Barometer 30.30 29.95 29.60 



May. — Fine till 13th, when some rain fell in the evening, preceded 

 by thunder and lightning ; on the 14th very loud thunder and lightning 

 with much rain ; on 15th (last quarter moon) 20th and 21st heavy rains; 

 a gale of wind on 21st from the south-west, which did much mischief 



