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Since Feulgen introduced his “Nuclealreaktion” for the demonstration of nucleoproteids, several papers have been published by Continental workers recording the results of the application of this method to a wide range of animal cells. The general consensus of opinion is that the method provides a precise microchemical colour reaction for thymus-nucleic acid protein complexes. No other cell structures, or inclusions of any kind are stained, when the correct procedure is employed.

Studies in the microchemistry of the cell. I.—The chromatin content of normal and malignant cells, as demonstrated by Feulgen's “Nuclealreaktion."