7Y.V C'S SVL VESTRIS. 1 5 9 



the handle of a dissecting needle. Examine with a high 

 power, and note 



//. The empty extine, distorted by the pressure, and 



stained yellow. 

 /. The intine, blue, much swollen, and either empty 



or still containing the protoplasm, starch and 



oil. If empty the smaller cell can usually be well 



seen. 

 j. The yellow protoplasm, dark blue starch grains and 



clear oil drops, escaped from some of the pollen 



grains. 

 k. Draw a pollen grain, showing all its parts. 



2. The cone. Take a cluster of female flowers, bisect it 

 longitudinally, and from one of the halves cut longi- 

 tudinal radial sections. Treat with potash. Examine 

 with a low power, and selecting a section which has 

 passed through an ovule, note 



a. The central axis bearing the bracts, each subtend- 

 ing a carpellary scale, to whose upper surface the 

 oi'itle is attached. 



/>. The body of the ovule, nucellus, surrounded by 



c. The integument, which is prolonged beyond it. 



d. The continuity of the nucellus and integument 

 with the carpellary scale. 



e. The orifice in the integument at its proximal end, 

 the micropyle. 



f. Draw, showing the above points. 

 Examine with a high power, and notice 



g. That the cells of the nucellus, integument and 

 scale are all alike parenchymatous and filled with 

 protoplasm. 



Dissect out a carpellary scale from the central part of a 

 year-old cone and cut a series of longitudinal sections, 



