THE LIFE OF A PRIMROSE. 
I6 7 
corolla, are each alternate with one of the calyx leaves, 
so that anything which got past the first covering 
would be stopped by the second. Lastly, when the 
delicate corolla has opened out, look at those curious 
yellow bags just at the top of the tube (b, 2, Fig, 45). 
What is their use? 
FIG. 45. The two forms of the Primrose-flower, a, Stigma or 
sticky head of the seed-vessel, b, Anthers of the stamens. 
c, Corolla or crown of the flower, d, Calyx or outer cover- 
ing, sv, Seed-vessel. A, Enlarged pistil, with pollen-grain 
resting on the stigma and growing down to the ovule. 
0, Ovules. 
But I fancy I see two or three little questioning 
faces which seem to say, " I see no yellow bags at 
the top of the tube." Well, I cannot tell whether 
you can or not in the specimen you have in your 
hand; for one of the most curious things about prim- 
rose flowers is, that some of them have these yellow 
bags at the top of the tube and some of them hidden 
down right in the middle. But this I can tell you: 
those of you who have got no yellow bags at the top 
will have a round knob there (i a, Fig. 45), and will 
find the yellow bags (&) buried in the tube. Those, 
