236 THE FLOWER 



Dead nettle Lamium amplexicaule, L. alburn. 



Sage. . Salvia officinalis and other species. 



Catmint . Nepeta cataria. 



Iris . . Iris (various kinds). 



Carrion flower . . Smilax herbacea. 



Bear's grass Yucca filamentosa. 



Spanish bayonet Yucca aloifolia. 



Lily of the valley Convallaria majalis. 



Day lily . Hemerocallis fulva. 



PRACTICAL EXPERIMENTS 



Experiments should be made by enveloping buds of various kinds in 

 gauze, so as to exclude the visits of insects, and noting the effect upon the 

 production of fruit and seed. Envelop a cluster of milkweed blossoms 

 in this way and notice how much longer the flowers so protected con- 

 tinue in bloom than the others; why is this? Try the same experi- 

 ment upon, the blooms of cotton and hibiscus if you live where they 

 grow, and see whether the characteristic change in color occurs in 

 flowers from which insects have been excluded and whether good seed 

 pods are produced by them. Try the effect upon fruit production of 

 excluding insects from clusters of apple, pear, and peach blossoms. 



