COMMENTS on the proposed plan, an outline of which appeared in the March issue of the AMERICAN JOURNAL OF PUBLIC HEALTH, were received from but twenty-three of the forty-six laboratories within the time limit set for compilation of this report. The twentythree laboratories include those of the United States Army and Naval Medical Schools, the Hygienic Laboratory, four state and two large municipal public health laboratories, eleven laboratories associated with hospitals or universities, one private laboratory, and two institutes for research. Exact tabulation of the answers as for or against each requirement proposed proved difficult since many expressed general agreement but mentioned only a few points specifically. Including statements of general as well as specific agreement, two-thirds to three-fourths of the replies were favorable to all but a few of the recommendations, and less than one-third were definitely unfavorable to any single point. Full and exact quotation of the various opinions on each question is not within the scope of this report, but the different points of view may be seen from the following abstract of the discussion of both the general and technical requirements.