ANTHOPETTA. 



241 



454. The pollen-cells are roundish, and covered by a 

 double wall, the outer being thick and hard, and in some 



4,^/aaxjs-ar 



Fig. 143.— a ripe cone of a Pine, partly cut away to show the position of 

 the seeds, g; A,a scale from a young cone, upper side showing two ovules 

 (enlarged) ; B, the Fsame when mature, showing two winged seeds, ch. 

 Each seed-ooat has a small pore, M, ttrough which the first root will 

 grow in germination. 



cases swollen out into bladder-like enlargements, appar- 

 ently for the purpose of enabling the cell to be carried in 

 the air (Fig. 143, S). One or more cells of the rudimen- 

 ary sexual plant are always present (Fig. 143, «/). 



455. The ovule-bearing flowers consist of the well-known 

 cones which, when mature, bear the seeds (Fig. 143). 

 The cone consists of a stem bearing many leaf -like scales 

 plpsely crowded together, and upon these the ovules are 



