For many years down to 1953, our knowledge of Maltese prehistory could be summed up succinctly if rather unkindly in the phrase—‘Neolithic 3,000 B.C., Bronze Age 2,000, Punic 1,000.’ In that year, J. D. Evans's researches were published in these Proceedings. These at last provided a framework for his Period I, no longer called ‘Neolithic’ because the overlap of its later phases with metal-using cultures in nearby Sicily made it unlikely that metal was quite unknown. It was assigned a duration from the mid-second to mid-first millennium B.C. The absolute chronology will need revision in the light of the C-14 dates not then available and the correlations with the Sicilian development have met with some criticism. In any case, the isolation of the different phases was an enormous advance on which all further work in Malta will have to be based, even if, as at the time of writing begins to seem likely, certain amendments to the sequence become necessary. The later prehistoric Period II, lasting down to the 9th century when the Phoenician settlement opened Period III, was described in much less detail.Enormous quantities of material of the first period, megalithic buildings as well as pottery and small finds, were available for study: the material remains of Period II were much more scanty, there being in effect at that time only a single site known of each of its three phases, which were correspondingly named after the Tarxien Cemetery, Borġ in-Nadur and Baħrija. In 1956, Evans published a more detailed study of the first of these phases bringing forward evidence for attributing to it the local dolmens. Phases II B and C were not ready for such treatment as the only excavations were at Borġ in-Nadur in 1881 (a sketch plan found in a Valletta photographer's shop twenty years later being the only record) and 1921-7 (disturbed levels overlying a Period I temple); and at Baħrija in 1909 (three days' work). These two phases therefore remained the most urgent problem in the prehistory of Malta. Accordingly, further excavation was undertaken on their type sites by the Museum Department of the Maltese Government in the spring and autumn of 1959.
The three phases of nerve heat production
