The concentration-dependence of the eutectic peak widths in isobaric DSC curves is investigated. Pursuant to the relationships derived, these widths become maximum at the eutectic point. Depending on the thermophysical properties of the sample, further maxima might arise of which the loci are predictable. The correlation between the heat flow registered during a DSC scan and the specific heat capacity represented in the DSC curve is met under certain conditions only. A precise determination of heat capacities by DSC is thus questionable.