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In recent years there has been a renewal of interest in the question of ‘history’ in the Fourth Gospel, an interest exemplified in such books as A. J. B. Higgins's The Historicity of the Fourth Gospel and C. H. Dodd's Historical Tradition in the Fourth Gospel.1 The serious insistence of these studies on the historical element in the Gospel brings a much needed correction of the tendency to regard nearly everything in it as purely symbolic. On the request of the Greeks to see Jesus (John 12.20ff) Bultmann comments that the fact that the request is conveyed to Jesus by Philip and Andrew ‘must also have symbolic meaning’.2 And the tendency to close the door on inquiry into the historical element is illustrated by the word ‘only’ in G. H. C. Macgregor's comment: ‘The Greeks are brought on the stage only as a cue for Jesus' great discourse upon the necessity of his death and the universal salvation which will result from it.’3

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Improved high-temperature (1700°F, 925°C) dust removal concepts are being developed for pressurized fluidized bed combined cycle power generation. Recent results on cyclones, electrocyclones, an acoustic agglomerator, a ceramic bag filter, and an electrostatic granular bed filter are reviewed. The development status of each device is described, and the relative merits of each concept are discussed. System designs for employing each of the dust removal concepts in a 650 MWe PFB reference plant are presented in order to illustrate the application of the devices, and approximate economic comparisons are made for this application.