XII.] 



BOTANY. 



61 



pistil, the whole inclosed in two sets of green bracts. 

 Pistil with i cell and 2 styles. 



FIG. 40. Spikelet of Wheat, enlarged. 



86. It has been already stated that the above organs 

 of a flower are all formed on the plan of leaves, but 

 modified for different purposes. The best evidence of 

 this is afforded by, (a) the calycanthus, which shows 

 the transition from leaves to bracts, from bracts 

 to sepals, and from sepals to petals ; by (<), the white 

 water lily, which shows the transition from sepals to 

 petals, and from petals to stamens ; (c\ the garden rose, 

 and most double flowers, which show the transition 

 from petals to stamens ; (d), the double tulip, which 

 shows the transition from stamens to pistil ; (<?), the 



