304 



Scientific Intelligence. 



[July, 



Thermometer at Macao, Lat. 22° 16'. 

 Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. Mean. 



Mornir 



ig. 



62 



59 



66 



73 



77 i 



12 84 



82 



81 



75 



65 



62 



72.3 



Aftern. 



9 



65 



59 



69 



75 



78 J 



J4 88 



85 



84 



78 



68 



65 



74.8 



Highest, 



72 



71 



77 



83 



85 89 92 



90 



88 



86 



80 



70 



81.9 



Lowest 



i 



53 



49 



55 



66 



71 74 81 



79 



76 



61 



57 



57 



64-9 

















Mean temperature of Macao, 



73.5 







Fall of Rain at Macao, from 1812 



: to 1831, in 



s inches. 







1812 



1.0 



2.6 



5.4 



6.1 



19.8 



16.0 



12.2 



14.1 



17.6 



6.0 



4.3 



2.2 



107.3 



1813 



0.8 



1.6 



1.0 



4.2 



14.8 



13.0 



5.8 



5.7 



5.1 





2.2 



0.5 



54.5 



1814 





3.1 



2.8 



5.4 



18.6 



29.0 



11.9 



7.2. 



4.4 



4,5 



8.8 





95.7 



1815 





From 1st 



January to 31st Decembe 



r, 











64.5 



1816 





Ditto ditto, 



















48.8 



1819 



2.5 



3.8 



2.7 



2.0 



8.0 



4.2 



4.3 



18.5 



6.0 



4.6 



1.8 



1.1 



59.0 



1820 



1.5 



0.3 



1.7 



3.5 



5.0 



5.0 



7.5 



5.8 



20.8 



13.0 



1.0 



0.8 



65.9 



1821 



1.0 



3.6 



2.4 



5.0 



9.2 



10.2 



8.0 



11.5 



2.7 



10.5 



2.5 



2.0 



68.6 



1822 



0.5 



0.3 



1.2 



3.8 



17.8 



9.1 



3.2 



7.0 



12.6 



3.0 



4.8 



0.3- 



63.6 



1823 





0.1 



0.6 



5.6 



1.0 



12.8 



11.6 



7.0 



6.0 



11.0 







55.7 



1824 







0.8 



3.0 



6.2 



17.9 



4.7 



4.3 



16.7 



6.4 



7.0 



1.6 



68.6 



1825 





0.3 



4.0 



3.5 



8.5 



13.4 



7.0 



13.6 



8.2 



3.8 



1.0 



1.0 



73.3 



1826 



1.1 



2.4 



2.8 



18.6 



5.8 



4.4 



11.8 



11.5 



15.2 



3.5 



2.7 





79.8 



1827 







2. 





9.9 



8.7 



9.2 



16. 



3.5 



.6 



1.5 



1. 



51.8 



1828 



.1 



1.4 



3.6 



11.1 



22.8 



17.4 



10.9 



10.0 



16.2 



5.9 



0.2 



4.6 



104.6 



1829 



2.4 



5.1 



1.4 



10.1 



12.1 



4.2 



4.1 



9.2 



8.8 



1.0 





0.8 



59.3 



1830 





0.5 



1.0 



0.4 



4.4 



4.6 



7.1 



10.3 



19.4 



5.3 



1.0 





52.9 



1831 





1.2 



0-9 



6.6 



25.6 



7-7 



4.5 



7.0 



11-7 



9.2 



0.8 





75.3 



Mean 0.68 1.67 2.15 5.5611.85 11.10 

 Rainy 



days, 



3§ 7 6 10 15§ 



7.75 9.90 10.92 5.50 2.47 0.99 

 Mean annual rain, inches, 



10 12§ 



70.0 



10 



3f 



The averages at Canton are taken from the Meteorological Diary of the Canton 

 Register for 1831. Those at Macao are from a private diary by Mr. Blettermen, 

 durin°- the same year. — Companion to the Anglo-Chinese Kalendar of 1832. 



3. — Polyzonal Lens. 



We are grieved to learn by a letter from Sir David Brewster to Mr. George 

 Swinton, that there are at present little hopes of the accomplishment of the 

 grand object, towards which the liberality of the lovers of science in India 

 contributed so meritoriously a few years since. The failure of Messrs. Gilbert 

 and Co. Opticians, who had already, it seems, executed one Lens on the Polyzo- 

 nal principle for the Light-house Board, under the Dr.'s directions, had delayed 

 further proceedings : and although the Firm was again established, the loss of 

 all their tools and apparatus rendered it impossible for them to undertake the 

 job at the price before settled, namely £80. Dollond and Co. would not 

 attempt it under £400. Having experienced in these disastrous times the 

 greatest difficulty in getting subscriptions from scientific men, Sir David had 

 made a formal application to Lord Althorpe for some public aid, but this 



