The efficiency of wage-earners attaches itself to the question of wages. For domestic and personal service, a rich deposit of first-hand material was available in the written testimonials, secured by employment agencies, from the former employers of each applicant seeking work. This is a requirement of the Employment Agencies' Law. The investigator found two employment agencies which had used a printed blank for securing this testimony from former employers of applicants. These blanks asked four questions which are pertinent to the matter of efficiency, and an additional space was left for further remarks. The questions called for answers on the following points: (1) length of time employed, whether applicant was (2) capable, (3) sober or temperate and (4) honest. In all, 10,095 such blanks were sent out by the agencies during 1906-1909. About 3,000 were returned. Of these about 1,800 replies were excluded from this tabulation because they were received from employers outside of New York, because they were not completely filled out, or were not signed by the parties replying. For this study, 1,182 cases were used. Of these 139 were returned by the Post Office Department as unclaimed, 21 were returned unanswered, while 20 replied that the parties were never in their employ. So there were left 902 complete cases. These give a fair indication of the whole. The first point of efficiency is the length of service to one's employer. The records of 100 males do not furnish a sufficient number of cases for any sweeping generalization, yet considerable light is given by the percentages. These show that 30 out of the 100 remained with one employer less than five months; that 24 remained six to eleven months, and 17 from one year to one year and eleven months, while 25 were in one place for more than two years. Special mention may be made of the five following cases: One of them remained five years, one seven years, one six years, one eight years, and one ten or eleven years, with the same employer. For the females, the percentages will apply well to all who are wage-earners in domestic and personal service. Here, also, the largest percentage, 24.1 per cent, remained in one place from six to eleven months; 21.3 per cent remained three to five months; 16.7 per cent remained one year to one year and eleven months, and fair percentages obtain for the longer terms of service: namely, 5.2 per cent two years to two years and eleven months, and 9 per cent three years or more. Of those in one place of service for three or more years, five remained four years; two, four years and a half; nine, five years; three, six years; four, seven years; two, eight years; one, twelve years; three, fifteen years, and one, "eighteen years off and on;" in all, a total of thirty in 802 cases that were in one place of employment more than three years.