30 



PINUS. 



60. Male Flower. With a knife cut a median longitudinal section of a male flower 

 and draw : axis ; stamens ; pollen-sacs. Isolate one of the stamens and draw a magnified 

 view of the under surface. Shake out a little pollen on to a dry slide and draw it under the 

 high power. 



61. Female Flower. Draw a similar section of a female flower, showing : axis ; 

 carpellary scales ; placenta ; ovules. Isolate one of the scales and draw both surfaces. 



