analyst. By its aid it is possible to distinguish easily many solid
constituents of urine--normal and pathological; indeed, the
examination of urinary deposits is often quite as important as the
more elaborate wet analysis. A well-made instrument is no luxury to
the pharmacist; but even those whose chief aim is _bon marché_ can
procure capital students' microscopes at exceedingly low cost. One of
the cheapest, and at the same time an instrument of good quality, is
the "Star," manufactured by Messrs. R. & J. Beck, of 31 Cornhill, E.C.

Equipped with a good microscope, the analyst should obtain a fair
supply of typical slides for comparison. The following selection will
be found sufficient for his purpose: A set of the chief varieties of
uric acid, calcic oxalate, and triple phosphate; the urates and
oxalurates; urea nitrate, calcic hippurate and carbonate, hippuric
acid, cystin, well mounted "casts" of the _tubili uriniferi_,
spermatozoa, etc. In doubtful cases microchemical reagents can be
employed, using Professor Attfield's "Chemistry" as a guide. Where
mounted objects are not at hand, reference may be made to the
capitally executed plates in that work. After obtaining a little
experience in the use of the microscope, no difficulty will be met
with in these examinations.--_The Chemist and Druggist._

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LIQUID AND GASEOUS RINGS.