BETWEEN THE VISCOSITY OF LIQUIDS AND THEIR CHEMICAL NATURE. 5G3 
The curves for the lower iso alcohols lie no longer uniformly on one side of those of 
the corresponding normal alcohols. The two available comparisons show that the . 
iso-curve cuts that of the normal isomer, so that at high temperatures the iso-curve, 
as is generally the case, lies to the left of the normal curve, whilst at low temperatures 
Fig. 18. 
it lies to the right, d-qjdt at any temperature is uniformly greater for the iso- than 
for the normal alcohol. 
The crossing of the curves is probably also to be traced to different rates of decom¬ 
position of liquid molecular aggregates. Ramsay and Shields’ observations indeed 
indicate that the molecular weight of liquid isobutyl alcohol is greater at low 
temperatures, and less at high temperatures than that of butyl alcohol. In the 
4 c 2 
