56 
ON THE EESIN OP PICES EEBIGINOSA. 
On reviewing the members of which benzylic alcohol of Caxn’izzaeo is the type, and 
with which our new alcohol must be classed, it will be perceived that there are still 
many gaps to be filled up in their series. 
Benzylic alcohol (Kresylic alcohol, Taurylic alcohol) 
Cuminylic alcohol (Thymol and Carvacrol) . . . 
CuHg Og 
Ci6 Hio Og 
C18H12 oj 
C20 Hi 4 O2 
C22 Hjg Oj 
C24 Hia O2 
C^g H20 ^2 
Qs H22 O2 
CI30 H24 O2 
f ^32 H26 ^2 
C,, O 
lunkn 
own. 
Sycocerylic alcohol Cgg Hgp O 
28 ^’2 
2 
■unknown. 
On comparing the properties of our sycocerylic alcohol with those of benzylic alcohol, 
very little resemblance will at first be traceable between them ; but when it is remem- 
bered that there are not fewer than ten steps between benzylic and sycocerylic alcohol, 
this difference of properties is easily accounted for ; more particularly if we take into 
consideration a similar case in another homologous series, the links of which are more 
fully known. The change in the properties of the acetic acid series, for example, by 
each increment of increase of C 2 Hg, is quite as remarkable ; and when we compare acetic 
acid on the one hand with palmitic acid on the other, the dissimilarity is not less remai'k- 
able than if we compare sycocerylic alcohol, CggHgoOg, mth benzylic alcohol, C^HgOa. 
In conclusion, we may mention that benzylic alcohol, and consequently also cuminylic 
alcohol, are generally considered to be homologues of phenyl-alcohol (carbolic acid); 
kresy 1-alcohol would be isomeric with benzyl-alcohol, and carvacrol and thymol with 
cuminylic alcohol. On comparing these substances we find that this view is not tenable, 
and that there exist in reality at least two distinct series of isomeric compounds, the 
types of which are benzylic alcohol on the one hand and phenylic alcohol on the other. 
The crystalline substance which adhered to the acetate of sycoceryl, and which it will 
be recollected was left in part undissolved when the acetate was dissolved out with 
ether, can be obtained in only very small crystals. It is perfectly neutral, and we did 
not succeed in obtaining any derivative from it calculated to throw light on its true 
nature. The quantity was indeed extremely small, and we therefore content oui’selves 
with giving the ultimate analysis of it. 
0T806 grm. substance gave 0'5070 grm. carbonic acid, and 0’2000 water. 
These numbers give the following per-centage : — carbon 76 'SB, hydrogen 12 ‘SO. 
