VEGETABLE EXUDATIONS. 



By J. H. MAIDEN, F.L S., F.C.S., 



Curator Technological Museum, Sydney, and Botanist Forest 

 Department, Sydney. 



The vegetable 

 consist of : — 



PREFATORY NOTE. 



exudations brought home by the Expedition 



One Manna (Myoforum platycarpum). 



Two Gums (Acacia leiophylla and Brachychiton Gregorii). 



Three Kinos (Eucalyptus tessellaris, E. incrassata, and 



E. incrassata, var.). 

 Two Resins (Gallitris verrucosa and Xanthorrhcea 



Preissii). 



The gums, kinos, and resins present no remarkable features. 

 J-he manna is, however, a more interesting substance, and 

 although it has been collected hundreds of times, and has been 

 otten brouglit under the notice of Australian scientific men, yet 

 no one appears to have ascertained its composition. It proves 

 to consist almost entirely of mannite, and its composition i.s 

 practically identical with that of the ordinary commercial manna, 

 ot Europe obtained from Fraxinus Ornus. This is the first 

 time a true manna has been announced from Australia, as the 

 so-called Eucalyptus-mannas are composed of sugars other than 

 mannite. It would now be interesting to examine some barks 

 ^'^M *^ Australian vegetable products for mannite. 



Myoporum-manna is a perfect substitute for its European 

 namesake, and when freshly exuded its colour is not objectionable- 



MANNA. 



Myoporum platycahpum, H. Br. 

 N.O. Myoporinem : " Sandal-wood." 

 Collected 29th Septembei-, 1891, at Camp 65. Clayey sand, 

 •-ollector's note :^ i J J 



luo^}l'^''^^ °^™ ^^^'^^ ^^^"^ collected partly off' a small tree 20 feet 

 nr' T ^°"'' "^'^''®''' "^ diameter, and is the one on which I 

 _^oticed gum (manna, J. II. M.) oozing out, and partly from under 

 as tl ^'^'^^ ^^^ '^^^'^ bleeding profusely, and for a long time, 



"lere was a great deal of decaying gum (manna) round the 



