36 J. H. MAIDEN AND H. G. SMITH. 
As this shows a loss of less than two-tenths per cent in the 
carbon, and less than one and a-half tenths per cent. excess in the - 
hydrogen, on the mean of the two combustions, and as these — 
differences are allowable, and in correct order as errors of experi: 
ment, we may consider C,,H,,O, as the correct empirical formula. — 
The molecular formula is a matter for future consideration, when 
decomposition products of a satisfactory nature shall have been 
obtained. ; 
Do “Tursip” Kinos contain Extacic Acip? 
As eudesmin is soluble in hot water and but slightly in cold 
water, this property of course indicates that it assists to give 
turbidity to aqueous solutions of kinos, but the large proportion | 
of a resinous looking body extracted by ether, and left on removal — 
of eudesmin, points to the fact that eudesmin is not the 7 
substance that causes this turbidity. 
: 
As before mentioned, it has been stated emphatically that the 
substance causing this turbidity is ellagic acid. We will submit 
that ellagic acid is not present in either the kino of Hucalyptus . 
hemiphloia or in that of Angophora lanceolata, (the only two 
turbid kinos exhaustively examined). The ready solubility 2 
boiling water of the precipitated substances on cooling from a hot 
substance cannot be ellagic acid, as this acid is practically a 
in water even on boiling.* Its ready solubility in alcohol als0 | 
tends to indicate that it is not ellagic acid. As the precipitated | 
powder causing the turbidity when the kino of Angophora lance 
lata is treated with water, has been particularly mentioned as 
consisting of almost pure ellagic acid, and as the kino of Angophor@ — 
lanceolata does not appear to contain eudesmin, a portion of the — 
above precipitated powder (from cold water) was taken and | 
decomposed by fusing with potash. The products of decompositio® — 
were found to be protocatechuic acid and acetic acid; these : 
re 
* Vide Watt's Dictionary of Chemistry, (Morley & Muir) Vol. 1., pag? 
430, where the properties of ellagic acid are given as “minute yellowish 
prisms, insol. water and ether, sl. sol. alcohol,” &c. 
