FOR over forty years the only recognized form of coccidioidal disease was the usually fatal progressive coccidioidal granuloma. Then the recognition by Gifford and Dicksonl-4 that Coccidioides immitis causes an illness which is benign and selflimited enormously broadened this concept. Their addition of coccidioidal erythema nodosum (" Valley Fever") created a true disease spectrum.5'6 However, many questions were raised in the process. Coccidioidin skin testing had shown that a large proportion of the individuals of the southern San Joaquin Valley reacted, yet the coccid-* From the Commission on Epidemiological Survey of the Board for the Investigation of Epidemic Diseases, Preventive Medicine Services, Office of the Surgeon General. The special studies on coccidioidomycosis have been conducted in the

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The method of Frobenius is used to solve for the exact frequencies and mode shapes for rotating beams in which both the flexural rigidity and the mass distribution vary linearly. Results are tabulated for a variety of situations including uniform and tapered beams, with root offset and tip mass, and for both hinged root and fixed root boundary conditions. The results obtained for the case of the uniform cantilever beam are compared with other solutions, and the results of a conventional finite-element code.

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