382 Scientific Intelligence. Meteorology. 



the earlier years (14 to 17) than in Belgium, and slower after- 

 wards. This seems more strongly indicated in the English than in 

 the Scotch curves. 



3. The superior physical development of natives of this country 

 above the Belgians is very marked. In strength it is greatest (th 

 of the whole) ; in height least. 



4. So far as the English and Irish curves can be considered as 

 correct, they indicate that the English are the least developed of 

 the natives of Britain at a given age, the Irish most, the Scotch 

 retaining an intermediate place. 



5. The maximum height is barely attained at the age of 25. 



6. All the developments increase during the period of observa- 

 tion (14 to 26 years of age), and all increase more slowly as age 

 increases. Hence the curves are all convex upwards, (the abscissa? 

 or ages being projected horizontally). 



3. Description of a Single Achromatic Eye-Glass. By Ed- 

 ward Sang, Esq. 



SCIENTIFIC INTELLIGENCE. 



METEOROLOGY. 



1. Solar Radiation. Sir John Herschel, in a communication 

 to M. Arago, says, that the solar radiation is greater in tropical 

 than in temperate countries. Thus, that, by means of his act- 

 ninometer, he found the solar radiation at the Cape of Good 

 Hope to be 48 j, while in Europe the maximum of the direct 

 solar radiation does not exceed 29^. 



2. Lunar Halo. I started one night in December from Port 

 Louis to walk across to the military post at Flacq, and my path 

 lay for several miles through a very wild district, along what 

 had originally been a road, but the rapidity of tropical vegeta- 

 tion, and a coup de vent, had made it in several parts difficult 

 to be recognised, and especially oti the night in question, as the 

 moon was not high, and the trees, occasionally of magnificent di- 

 mensions, spread a deep shade around for several yards. I was 

 picking my way along a space rather less inclosed than that 

 through which I had already come, endeavouring to keep the 

 beaten track, that my boots, already nearly saturated, might im- 

 bibe as little as possible of the dew, and listening, because I 



1 ' 5? 



