UTILISATION OF RESIDUES OF ESSENTIAL OIL. 225 
1° cuminal in 10% ethylalcohol gave a co-efficient of 12. 
32°5% ethyl alcohol solution has a co-efficient of 0°031. 
1% of crude oil freed from phenols and aldehydes plus 
7% rosin soap has a co-efficient of °05. 
7% rosin soap has no co-efficient, i.e., is nou-germicidal. 
The aldehydes, cuminal and phellandral when mixed with 
the rosin soap retained their co-efficiency, that is, did not 
lose their germicidal properties, although this is not the 
case with every aldehyde, cryptal being one of the obvious 
exceptions. When the phenol is incorporated with the 
soap it was found that the co-efficiency gradually increased. 
In the crude oil and soap mixture the co-efficiency increased 
with the dilution. The dilutions, however, must be made 
when the soap solution is added, otherwise no increase 
takes place. If the 5% is diluted to 0°5% the co-efficient 
would be 3°25(=6°5 to bring it up to unity) and not 9. [See 
Table (b)] 
Investigations are in progress to determine the actual 
changes which take place in regard to this observation. 
An emulsion of the residual oil after removal of the active 
constituents was mixed with 7/ soap solution and tested 
for any germicidal qualities. A reference tothe table will 
show that this residue hada very slight value, probably 
due to traces of the active constituents. 
Summary.—(1) The crude residual oil resulting from the 
steam distillation of the essential oil of Hucalyptus cneo- 
rifolia was found to have the following approximate com- 
position,—Australol (phenol) 65%. Aromatic aldehydes. 
Ouminal and phellandral 5°0% (mostly cuminal). Oryptal 
18°0%. Sesquiterpenes, sesquiterpene alcohols, and poly- 
merised bodies, balance. 
O—December 6, 1922. 
