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Radiation from the carbon arc, modified by four Coming glass filters with successive cutoff points separated by about I5OO A, was used to produce cutaneous bums in pigs at a constant ejcposure time of 0.5 sec. It was found that the ^O^ effective expostires for 1+, 2+ and 3+ burns increased progressively with increase in wavelength. The effect of varying both spectral distribution and exposure times on the production of 2+ bxims was also investigated. At O.5 sec. the requirements of radiant energy of wavelength greater than 65OO A was 27^ greater than that of wavelength greater than 360O A. At 2.0 and Ij-.O sec. it was k2^ greater. The increase from 27^ to k2^ with increase of e3q)os\ire from O.5 to 2.0 or k.O sec. is significantly different at the 0.95 level of confidence. This demonstrates a failure of reciprocity of time-intensity relationships of different magnitTide with the two different filters in burn production.

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