EUCALYPTUS OIL GLANDS. 



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the glands, (E. Smithii being selected for the purpose) 

 can best be studied in a'section of a leaf bud. The gland 

 is then represented by a mass of thin walled parenchy- 

 matous cells with dense granular contents. Due partly 

 to increase in size of the leaf, and consequently of the oil 

 gland, the adnate mass of cells separates, forming a hollow 

 ball. Further increase in size causes a breaking away of 

 the central body from the interior walls of the enlarged 

 gland, aud disintegration occurs in the innermost cell 

 tissues. Finally the gland is usually seen to be lined with 

 the remains of collapsed cells, evidently caused by the 



Highly magnified median section of an oil gland in an inter- 

 mediate stage of development. The separation of the interior cell 

 mass (in section) from the wall of the cavity is quite pronounced. 

 An extremely thin lid cell is seen at the top of the gland. The 

 groups of small cells on either side of the gland indicate vascular 

 bundles. Eucalyptus Smithii R. T. Baker. x 400. 



