We studied the genetic relationships and postglacial dispersal of northern pike (Esox lucius) populations in North America using allozyme data. Allelic products of up to 65 protein coding loci were examined in eight populations: five from drainages in western Canada, flowing into Hudson Bay and the Beaufort Sea; two from the Missouri River drainage, flowing into the Mississippi River; and one from the upper Mississippi River drainage, flowing into the Gulf of Mexico. Only two polymorphic loci were identified, Est-1 and Ck-1, and the average observed heterozygosity was only 0.001, much lower than that observed in most teleosts. All of the populations from the drainages in western Canada and the Missouri River were genetically identical. The Mississippi River population was unique, expressing Ck-1 (140), an allele nearly absent in all other populations, at a frequency of 0.99. Our data suggest that the Missouri River drainage, during the period when it was isolated from the Mississippi River, was the southern refugium from which northern pike radiated during deglaciation.

This paper summarises the results of work carried out during the years 1949–51 in the eastern Gebel of Tripolitania. The area had been visited, and some of the sites noted, by nineteenth-century travellers and by Italian archaeologists between the wars, and the adjacent plateau of Tarhuna has been the subject of a recent paper by R. G. Goodchild. My work was complementary to his, and I have not reproduced the details of information so lately set out except where they were immediately necessary.I was able to spend long periods in the territory while holding the Scholarship in Classical Studies at the British School at Rome and a Research Scholarship at Trinity College, Cambridge, and I am deeply indebted both to the School and to my college for their generous support in unusual circumstances: in particular the latter, for providing a truck which carried me over fifteen thousand miles in difficult country and for a generous grant towards the cost of illustrating this paper.

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