The heats and temperatures of transitions were measured for five pure compounds which were known or expected to form mesophases or liquid crystals. The five compounds were N-(p-cyanobenzal)-p-anisidine,p-(4-cyanobenzalamino)-cinnamic acid-active amyl ester, N, N'-tereph-thalylidene-di-p-toluidine,p-acetoxy-cinnamic acid, andp-[N-(p-methoxy-benzylidine)-amino]-phenyl acetate. Temperatures of transition for the compounds are reported here for the first time using a well-calibrated differential thermal analyzer. Heats of transitions for the compounds have not been previously reported. They were measured here by differential scanning calorimetry.