282 SPORES AND GLANDS. 



(136) Lupulin. 



Lupulin consists of the glands obtained from the strobiles of 

 the hop, Humultts Lupulus, L. (N.O. Urticacese). 



Each gland consists of a hemispherical layer of cells, the 

 common cuticle of which has been raised, dome-like, by the 

 secretion of oil between it and the cell walls. When fresh, the 

 gland is pale yellow or golden yellow in colour, and filled with a 

 yellowish oily emulsion ; this, by keeping, gradually darkens in 

 colour, and contracts to form a rounded, brownish mass. The 

 glands measure from 140 to 200,u in diameter. 



