30 Proceedings of the Royal Irish Academy. 



It seems safe to predict that all the isomeric amyl alcohols, with the 

 exception of the normal alcohol (1), can form such mixtures. There is 

 no doubt that the secondary and tertiary butyl alcohols could do so. 



Methyl alcohol, of course, forms no ternary azeotropic mixture with 

 toluene and water. The upper limit of the A.T.W. curve is at about 114°, 

 and it is therefore quite possible that amyl alcohol (6), b.p. 113°, and probable 

 that amyl alcohol (8) can form a ternary azeotropic mixture, and it is certain 

 that the secondary and tertiary butyl alcohols can do so. On the other hand, 

 it is most probable that n-hxxtjl alcohol and amyl alcohol (3), and certain 

 that all alcohols of still higher boiling point, cannot form such mixtures. 



Lecat has prepared and examined a number of binary aud ternary 

 azeotropic mixtures formed by the hydrides of benzene [cyclohexane, CeHu, 

 b.p. 80-75° ; cyclohexene, CsHm, b.p. 8275° ; and cyclohexadiene, 1 : 3, CeHs, 

 b.p. 80'8°] with the lower alcohols, and with the lower alcohols and water. 

 The results are very similar to those with benzene. 



