A report is presented on the use of the carbon dioxide (CO2) laser for the removal of recalcitrant warts of hands and feet of 27 patients. Of the 27 patients 22 (81%) required only one laser treatment to eradicate warts and remain free of lesions at the 6-month follow-up visit. The other patients required up to 3 retreatments with the laser during the first 6 months to remain free of lesions at a 6-month follow-up. The CO2 laser provided a bloodless surgical field, accurate control, minimal postoperative pain, and decreased postoperative infection. The authors conclude that, while the CO2 laser is not without its disadvantages, it should be considered an important adjunct in the treatment of difficult, widespread, or recalcitrant verrucae.

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Germund Hesslow has argued recently [2] that a probabilistic theory of causality as advocated by Patrick Suppes [4] has two problems that a deterministic theory avoids. In this paper, I argue that Suppes' probabilistic causal calculus is free of each of these problems and, moreover, that several broader issues raised by Hesslow's discussion tend to support a probabilistic conception of causes.

Reid, Scherer, Herbut, and Irving (I 942) noted nodules surrounded by haemorrhage in both maculae of a patient dying of systemic histoplasmosis. A relationship between a form of uveitis with specific morphological features and evidence of exposure to Histoplasma capsulatum was also suggested by Day (I 949), Krause and Hopkins (I 95 I), and Schlaegel (I 958).Woods and Wahlen (i959) described a specific ocular complex characterized by multiple small, discrete, focal, nonpigmented or sparsely pigmented lesions or scars in the mid or peripheral fundus (Fig. I) and a "disciform" lesion in the foveal or perifoveal area with or without surrounding haemorrhage (Fig. 2). They determined that patients with these features were frequently sensitive to histoplasmin skin antigen and postulated that systemic infection with Histoplasma capsulatum was responsible for this specific ocular condition. Later investigators have added to the above complex peripapillary chorio-retinal scarringCase 4. Red-free.fundus photograph, show)ing peripheral atrophic pigmented and non-pigmented lesions