We are delighted that Dr. Baker was so stimulated by our paper on medical biology and are happy to have his semantic analysis of some of the pertinent comments. It is always a pleasure to find someone who is in such substantial agreement with one's views. In passing it might be pointed out that unifying concepts [italics are ours] may arise from any number of intellectual approaches: analytic, synthetic, their combination—or perhaps free association. Whether or not any idea or concept unifies can, of course, only be tested operationally.
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