Modern sophisticated petrophysics has a part to play in petroleum ex- ploration, production and reservoir development, the ultimate importance of which is as yet undreamed of. In this total endeavour, the petrophysicist OWLS Journal Vol. 10, No. 1, June 1978 19 G. E. Dawson-Grove occupies a vital, central, potentially controlling position. He is, in fact, like a spider in his web.