37& 

 "Ashes," " Stringybarks," and some of the "Gums." whilst the liquid 

 modification is more pronounced in those members belonging to the earlier 

 groups, E. eximia for instance. It is also worthy of record that, so far, eudesmol 

 has not been found to occur in the oils of species belonging to the typical " Box 

 group, E. hemiphloia, E. Woollsiana, &c, and with the exception of two species 

 E. elaophora and E. stricta) not in those of any species which contain one or 

 more members of the cyclic aromatic aldehydes. 



Plate lxxxv (^page 375) illustrates very well the three different stages 

 which may take place in the physical condition of eudesmol. 



Originally the vessel was three parts full of pure crystallised eudesmol, 

 melting at 79-80° C, which had been prepared from the oil of Eucalyptus 

 camphora. After standing a few months the crystallised eudesmol had changed 

 to the liquid condition, and had settled down to the layer shown at the bottom 

 of the bottle. Some months after the formation of this condition, crystals began 

 to grow from the thick liquid mass, and continued to increase until finally the 

 whole assumed the appearance shown in the photograph. No further change 



Plate LXXXVI. 



Eudesmol, recovered from the second stage, or liquid 



condition, into which the original crystallised eudesmol 



had passed on keeping. 



has apparently taken place during the last seven years. The crystals of the 

 third stage which thus appear quite stable, are hair-like in character, quite 

 flexible, semi-transparent, but do not polarise at all well, and in many cases 

 exceed one inch in length. They melted at 79-80° and thus at the same 

 temperature as the original eudesmol. Under the microscope the crystals are 



