cent. All are light- coloured and therefore conspicuous on the 

 wing at dusk, and their fluorescence must add to their 

 visibility. 



The Ornithoptera fly high up in the full sunlight, but their 

 pattern is obviously designed to attract notice, and the 

 peculiarly bright and glistening appearance of the yellow 

 part of their wings, which is unlike the yellow of any other 

 butterflies, may be due to the fact that they are fluorescent. 



If solution in glacial acetic acid is evapoi-ated to dryness, water gives a deep yellow 

 non-fluorescent solution, ethyl alcohol a pale yellow very fluorescent one in the case 

 of 0. luteolata. 



Epping Forest. 

 The Secretary read a letter from the Essex Field Club 

 protesting against a Parliamentary Bill for the permanent 

 alienation of parts of Wanstead Flats and Epping Forest for 

 allotments, and on his motion, seconded by Lord Rothschild, 

 it was unanimously resolved to send a letter in similar terms 

 to the Prime Minister, and others who might be interested in 

 supporting the protest. 



