Summary — New discriminant analysis procedures have been presented to identify Africanized and European honey bees. These procedures are founded on data from 2 103 samples of honey bees collected from colonies at several locations in the western hemisphere and Kangaroo Island, Australia. Various univariate and multivariate analyses have been used to select the morphological characteristics and the groups of characteristics to be used in the analysis. The multivariate discriminant analysis correctly identified 565 (95.6%) of the 591 Africanized colonies and correctly identified all of the 1 512 European colonies.

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HORACJO N. SOLIMO, ROQUE RIGGIO, FRANCO DAVOLIO, and MIGUEL KATZ. Can. J. Chem. 53, 1258Chem. 53, (1975.Viscosities, densities, refractive indices, and enthalpies at 25 "C were determined for the systems: propionic acid + aniline (PA + A), propionic acid + N,N-dimethylaniline (PA + DMA), and propionic acid + pyridine (PA + P). From the experimental results the excess volume, excess viscosity, excess molar free energy of activation, and excess enthalpy were calculated. The deviations from ideality for the excess thermodynamic functions are more important for the systems PA + A and PA + P than for PA + DMA. There is evidence for complex formation between propionic acid and aniline in the following molar relation: 2 CH3CHzCOOH.C6H~NHz. Introduction Viscosities, densities, refractive indices, and enthalpies of some nonelectrolytes acid-base binary liquid mixtures have been studied to obtain information about the type and degree of interaction between molecules of the components. This is a continuation of our studies about thermodynamic properties (1-3).

using on the one hand eq 3, and on the other, the empirical relationships previously mentioned and derived from ref 1 and 2. The data represented have been evaluated at every 0.05 units of the molar fraction of benzene, x.The analysis of the figures permits us to establish the following: while for benzene + heptan-1-ol, the distribution of the values presented a negative deviation In relation to the straight line , -2(1 -x), now, for benzene + pentan-1-ol and benzene + pentan-2-ol, the deviation is positive. Likewise, It is Interesting to observe the shift that has taken place In the distribution of the points empirically and In a direction totally contrary to that of the -values. The shifting of «q_d, áL_,_, and has the same order In both systems as those of the benzene + heptan-1-ol mixture (see ref 1), giving the Impression of having moved -axls. While for the system CeHe + C7K15(OK)the empirical equation that produced the least deviation from experimental data was that derived from Lorentz-Lorenz, in this work that equation was that which caused the greatest differences due to the translation of the -axis previously mentioned. These differences are due to the particular behavior of each mixture. The mean errors obtained from the empirical equa-tions in relation to the experimental ones are respectively for benzene + pentan-1-ol and benzene + pentan-2-ol 9.73% and 12.21% with _ ; 15.05% and 16.41% with ; 21.46% and 22.59% with áL_L.Literature Cited(1) Ortega, J.

Densities, viscosities, and refractive indexes of the binary systems cyclohexanone + n-butanol, + sec-butanol, and + 2-methyl-1-propanol have been measured at 298.15 K and atmospheric pressure, over the whole composition range. The excess values of molar volume, viscosity, Gibbs free energy of activation of viscous flow, and internal pressure were calculated from experimental measurements. Based on the variations of the excess functions with composition, conclusions about the molecular interactions in these kinds of mixtures were obtained.