io6 



PHYSWLOG v. 



215. How the first leaf appears.— As the embryo backs out 

 of the seed, it turns downward into the soil, unless the seed 

 is so lying that it pushes straii^ht 

 downward. On the upper side of 

 arch thus formed, in the petiole 

 the cotyledon, a slit appears, 

 through thip "pening the first 

 arches its way out. The loop of 

 petiole comes out first, and the 

 later, as shown in 

 fig. 98. The petiole 

 now gradually 



FiK. Q.S, Fig. 99. Fig. 100. 



SecdlinKS"f jaclc-in-thc- Emhryos t.f iaik-in-thc-pulpit Seeinin)::nf iack-in- 



pulpit, first leaf arching still attached t'j tlie cndMsi.enn in the-pulpit ; sectmn 



out of the petiole of the seed coats, and showing the simple of tlte endosperm 



cotyledon. first leaf. and cotyledon. 



straightens up, and as it elongates the leaf expands. 



216. The first leaf of the jack-in-the-pulpit is a simple one. 

 — The lirst k'af of the embrvo jack-in-the-pulpit is \er\- tlifferent 

 in form from the leaves wliich we are accusfomeci to see on 

 mature plants. If we did not know that it came from the seed 



