In several copies of the April number of The Journal oF Experi mental Medicine (Vol. xliii, No. 4), through an error in binding, Plates 20–23 were inserted after page 588 instead of after page 572. We shall be glad to bind your copy correctly if you will return it to The Williams & Wilkins Company, Mount Royal and Guilford Avenues, Baltimore, Maryland.
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Copyright, 1926, by The Rockefeller Institute for Medical Research New York
1926
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