A Móra Ferenc Múzeum Évkönyve, 1969. 2. (Szeged, 1969)

Kiszely, István: Derivatographic Research of Subfossile Bones

substance of the bone, just as the organic one has its role in the evaluation. The derivatogramm is especially valuable if these two components can be measured together, can be shown in the same derivatogramm. Historical period at 380° С 580° С 960° С Upper Paleolith 6,5 7,5 12,0 La Tène С 9,0 13,0 21,2 Langobard 10,0 16,0 24,0 Gepid 11,0 17,0 20,5 Hungarian settlement 12,5 18,0 22,0 Middle Ages (13

th cent.) 12,7 19,5 25,0 Table 4. Termogravimetrical losses in weight in bones going back to different historical periods (in percentage). DERIVATOeRAHMS OF DIFFERENT AGES Fig. 4. Derivatogrammes of bones coming off different ages. After the preliminary measurements, made together with Peter DAVID, the author has prepared the derivatogramm of several bones, going back to different historical periods, this time under optimal circumstances. His results came closer up to the straight line given by Peter DÁVID (Fig. 5.); the gravimetrical loss of weight of the organic fractions, resisting to heat due to heat generation seemed nearly parallel with the absolute age. 222