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A computerised 8-channel data acquisition unit constructed by the Durham University Microprocessor Unit is described and the calibration of this unit is given in chapter 2. A test for the data acquisition unit using a Geiger-Mul1er cosmic ray telescope is described in Chapter 3. In Chapter 4 the main experiment is described. Two plastic scintillation counters each of 0.4 area and 5cm thick in coincidence were used in this experiment to measure the density spectrum of electrons at sea level in the range 20 - 600 electrons per m(^2). The microcomputer data acquisition system is employed to record the scintillator pulse heights. The measured integral density spectrum has been used to calculate the integral size spectrum at sea level. A brief description of the theory of electron-photon cascades and the formation of extensive are showers is give in Chapter 5.A FORTRAN program which uses Monte Carlo method to simulate extensive air showers generated by high energy protons with a given energy is described in Chapter 6. Using the relation between primary energy and average number of electrons arriving at sea level found by Monte Carlo calculation in Chapter 6 an estimate has been made of the integral primary energy spectrum in the range lO(^14)-lQ(^16)eV, and the result is given in Chapter 7.

Ray Bradbury's theory of writing and his writing practice concerning his views on the nature and role of the writer in society. The basic sources utilized were Bradbury's essays on writing, and his fictional works dealing with literature and authors. The thesis dealt in depth with his theory of writing found in his essay, "How to Keep and Feed a Muse." Although stories about writing and writers were taken from nearly every book Bradbury has written, particular emphasis was placed on Fahrenheit 451 and stories from books such as The Martian Chronicles which concerned bookburning societies. This thesis also considered critics who maintained differences of opinions about Bradbury's subject matter and his outlook on the future role of writing.In addition, this thesis discussed Bradbury's development as a writer as it related to his views on the nature of the writer. Finally, Bradbury's fiction exemplified his views on the roles of the writer as healer, moralist and prophet.