In a course of balneotherapy of rheumatoid arthritis, there was no proper standard to judge the therapeutic effect. In this circumstance, Thorn's test and a measurement of red cell sedimentation rate were applied to ten patients with rheumatoid arthritis before and after balneotherpy, and it was found that, although patients before therapy showed a low value of Thorn's test and a faster rate of red cell sedimentation, after released from　various symptoms by balneotherapy they had a higher value of Thorn's test and a slower rate of red cell sedimentation. Therefore, these two tests above described may be used as a standard for a judgement of the effect of　balneotherapy to patients with rheumatoid arthritis.

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