ae [Ixxvi 
foods of our ‘‘eabbage” butterflies, have yellow flowers, the 
reply is that these foods, for these butterflies, are entirely 
human inventions, and therefore comparatively modern. 
Their natural foods have chiefly white flowers, such as, 
Nasturtium, Avrabis, Draba, Cochlearia, Thlaspi, Lepidium, 
Turritis, Alliaria, and many others, the two last mentioned 
being the favourite foods of HZ. cardamines. It may also be 
suggested that the frequently very yellow under-sides of our 
common ‘‘cabbages” are due to the yellow flowers of our 
cultivated Brassicas, and of such wild Crucifers as Raphanus 
sinapis, and Barbarea. 
The Presipent, Mr. A. J. Cuirry, Dr. F. A. Dixry, Pro- 
fessor E. B. Poutton, and other Fellows offered observations 
on the subject. 
