EUCALYPTUS OIL GLANDS. 215 



Some glands showed marked contraction with 35%; others 

 did not until 85-90% was reached, though the contents 

 varied in granularity, especially under 85%. 



E. LONGICORNIS. 



Slight contraction occurred in 35%, but little effect up to 

 85% when contents became densely granular, the whole 

 breaking up in 95%. 



E. AGGREGATA. 



Some glands showed yellowish contents stretching irregu- 

 larly across the cavity, some were completely filled, others 

 again contained cellular tissue packed with globules. 30% 

 caused an increase in granularity, which continued up to 

 70-80% when coalescence to form droplets took place. 

 Gradual clearing and contraction occurred in 90% with 

 total disappearance in 95%. In some glands 80% was 

 sufficient for complete solution of the contents. 



E. LUEHMANNIANA. 



A number of the glands showed no contents, others were 

 completely or partially filled. In a number of cases "burst- 

 ing" of the contents occurred in 30%. Final solution 

 occurred usually in 50 — 60%. 



E. CORIACEA. 



Distinct cellular divisions were seen in some glands 

 though the majority were without contents or were 

 irregularly lined with dark substance, (the former case is 

 evidently due to the gland not being in median section). 

 Glands containing cellular tissue in which were dense 

 granules showed clearing up to 60% when only a few 

 globules were left. Those with a fringing of dark material 

 behaved in a similar manner. A few glands were observed 

 with the cavity completely filled with a matrix, but "burst- 



