_a._ KEAN, A. L. A new method for the microscopical examination of
water: _Science_, Vol. 13, p. 132, 1889; _Eng. News_, pp. 21,
276, 1889.
_b._ SEDGWICK, W. T. Recent progress in biological water analysis: _J.
N. E. Water Works Assoc._, Vol. 4, pp. 50–64, 1889.
_c._ ——. A report of the biological work of the Lawrence Experiment
Station: _Examinations by the State Board of Health of water
supplies of Mass., 1887–90_, pt. 2, Purification of sewage and
water, pp. 793–862, 1890.
_d._ PARKER, G. H. Report upon the organisms, excepting the bacteria
found in the waters of the State: _Examinations by the State
Board of Health of water supplies of Mass., 1887–90_, pt. 1,
Examination of water supplies, pp. 579–620, 1890.
_e._ RAFTER, G. W. The microscopical examination of potable water, D.
Van Nostrand Co., New York, 1910. (Contains bibliography.)
_f._ CALKINS, G. N. The microscopical examination of water: _Report
Mass. State Board of Health_, pp. 397–421, 1892.
_g._ JACKSON, D. D. On an improvement in the Sedgwick-Rafter method for
the microscopical examination of drinking water: _Tech. Quart._,
Vol. 9, pp. 271–4, 1896.
_h._ WHIPPLE, G. C. Experience with the Sedgwick-Rafter method at the
Biological Laboratory of the Boston Water Works: _Tech. Quart._,
Vol. 9, pp. 275–9, 1896.
_i._ ——. Microscopy of drinking water, 3d ed., John Wiley & Sons, New
York, 1914. (Contains bibliography.)