Seeds and Their Germination. 11 



the leaves folded ? Do the folds of one enclose the other or 

 do they mutually embrace ? Take a sheet of paper, fold it 

 crosswise and then lengthwise into four thicknesses, cut or 

 tear the side opposite the double fold into a shape similar to 

 that of one edge of a plumule leaf. Next, put these leaf 

 forms together so as to show how the plumule 

 leaves appear in the bud. Break off the coty- 

 ledons and lay the caulicle with its plumule 

 head up before you so that the plumule turns to 

 the right. Which leaf seems to overlap the 

 other?* Are the plumules of the two kinds of Fig 8 Com . 



..... . . .. . . -i f / mon bean with 



beans alike in this respect ? If you can get one cotvi don 



removed. 



beans in the pod find out whether the seeds 

 growing on one-half (valve) of the pod have plumules like 

 the one figured on this page, while those on the other half 

 have the overlapping of the leaves reversed. See that your 

 seeds are kept moist, but not very wet. Put several of 

 them in a bottle of water at home in order to find out 

 whether they will grow under water or not. 



EXERCISE 5. 



Examine one of the squash seeds. How many coats are 

 there? Which one is transparent? cork-like? hard? green? 

 Why no pocket ? Are the cotyledons just alike, or are they 

 bilaterally symmetrical ? Draw two views of the embryo. 



* The teacher should here have the pupils report by showing of hands 

 whether their specimens as in the figure on this page, have the lower leaf over- 

 lapping. 



