EUCALYPTUS ROSTKATA. 



tannic acid, wliich remains when the aqueous solution is shaken with ether, in which it 

 dissolves only to a small extent ; it is amorphous, of brownish color, of astringent taste, 

 precipitates glue as well as tartrated antimony and chloride of iron, the latter with dark- 

 green color ; is itself precipitated from a strong solution by concentrated sulphuric acid 

 and is not decomposed by boiling with diluted sulphuric acid. 2, Eucalypto-yallic acid 

 (H. Weber's eucalyptic acid) ; it dissolves in 34 parts of cold water, easily in hot water as 

 well as in alcohol and ether ; it forms whitish or yellowish long rectangular prisms or 

 needles of acid astringent taste ; its solutions turn yellow with alkalies, does not precipitate 

 glue (whereby it is separable from traces of tannic acid), yields a dark-blue solution with 

 chloride of iron, which on addition of ammonia acquires a rich deep purple tinge, afterwards 

 changing to claret-color, produces on careful heating pyro-gallic acid as a white lamellar 

 sublimate of bitter taste and of the characteristic reactions towards nitrate of silver, lime- 

 water, sesquichloride of iron and also sulphate of iron. 



(b). The solution of the lead-compound in acetic acid was acted on with sulphuret of 



hydrogen to eliminate the lead, and the liquid filtered oif and then reduced to concentration ; 



on shaking with ether it yielded to the latter : Eucalt/jHoic acid ; this is also soluble in 



alcohol and in water ; it forms a yellowish substance, interspersed with star-like arranged 



hexagonal crystals and tablets, has a bitter taste, and is decomposed on boiling with diluted 



sulphuric acid into fruitsugar and another (as yet unexamined) substance. Fridtsugar, 



which reduces alkaline tartrate of copper, remained in the solution after the elimination 



of eucalyptoic acid. 



B. The proportion of the aqueous extract, not precipitable by subacetate of lead, was freed 



by sulphuret of hydrogen from the lead. The concentrated filtered liquid, on shaking with ether, 



yielded to the latter : Eucalyptin, which is amorphous (crystallisable according to H. Weber), of 



brownish-yellow color, of soft consistence, without odor, of very bitter taste, of neutral reaction, 



soluble in about 75 parts of cold water, in less of boiling water and in still less of alcohol and 



ether ; its aqueous solution, when boiled with diluted sulphuric acid, evolves a peculiar odor, 



precipitates a yellow resinous substance, and reduces alkaline tartrate of copper ; it is not 



precipitable by tannic acid or any other reagents, indicative of alkaloids, nor sensibly affected by 



cold diluted acids nor by alkalies. Fruitsugar remained in the solution, from which the eucalyptin 



was withdrawn. It is left to be ascertained whether the febrifugal property, attributed to 



Eucalyptus-leaves, depends on the bitter glucosid, namely Eucalyptin, as seems probable, although 



the volatile Cajuput-like oil of the foliage possesses also undoubtedly powerful therapeutic efficacy. 



Gallic acid and its educt pyro-gallic acid is turned to account in photography, in dye-jjrocesses 



and for other requirements of technology. 



Explanation of Analytic Details. — 1, longitudinal section of uuexpanded flower ; 2, side-, back- and front- 

 view of stamens ; 3, style and stigma ; 4, 5 and 6, longitudinal section of fruit in its various stages; 7, transverse 

 section of fruit ; 8 and 9, sterile and fertile seeds ; 10 and 11, transverse section of wood ; 12 and 13, longitudinal 

 section of wood ; 1-9, moderately enlarged ; 10-13, magnified 200-220 times. 



Anatomic Plate. — 1, cellular cuticle of leaf, showing also the breathing pores ; 2, transverse section of aged 

 wood, with large openings of the vascular tubes, with rows of elongated cells, constituting the medullary rays, with 

 parenchyma-cells scattered and more copious near the vascular tubes, and with transverse sections of closely aggre- 

 gated woody fibres ; 3, tangential section of aged wood with wide and dotted vascular tubes, with transversely cut 

 cell-rows of medullary rays, with sparingly dotted woody fibres and with parenchymatous ampler interstices ; 4, 

 radial section of aged wood, with wide vascular tubes, with cell-rows of medullary rays cut vertically, with sparingly 

 dotted woody fibres and with parenchymatous ampler interstices ; all magnified 214 times diametrically. 



