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By his admirable summary, covering so thoroughly the general subject, Professor Welch has made much simpler the work of those who are to speak upon special divisions of the subject. In speaking of practical results I shall confine myself chiefly to my personal experience because it is with regard to that that I can speak most positively and which I feel most certain about. But I think where the results of one observer differ from those of another in this test one should be very careful in comparing the two, because very slight differences in technique, or interpretation of the phenomena observed will give a very different percentage in results.
My own experience consists so far in the examinations of somewhat over 600 bloods, of which more than half were from cases of typhoid fever. In these examinations and in my work I have been assisted very much by Dr.
JOHNSTON W. SERO-DIAGNOSIS IN TYPHOID FEVER.. JAMA. 1897;XXIX(3):95-97. doi:10.1001/jama.1897.02440290001001