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the atomic hypothesis. I trust I have succeeded in proving to the careful student that the symbols and formule of chemistry might be used with propriety and advantage, even if the atomic hypothesis were swept away.

In Parts II. and III. I was much assisted by Mr. E. Francis, F.C.S., Demonstrator of Chemistry in the Medical School of this Hospital. It is a pleasure to me to take this opportunity of thanking him for his valuable help in this and in many other things.

C. W. H.

CHARING CROSS HOSPITAL,

Christmas, 1871.

The following List comprises most of the apparatus required for performing the experiments described in the present work, and may be purchased by the set of Messrs. JACKSON and Townson, 89, Bishopsgate Street Within, who will also forward more extended lists of apparatus and pure tests, on application, by post. FIRST SET.-16s.

SECOND SET.-25s.

Packed in a Case, 268. 6d.
Packed in a Case, 178.

Includes the First Set with the extra

Apparatus Undermentioned.

1 Stoppered Hard Glass Retort, 4-ounce 1 Holder for Retorts, Tubes, or Flasks.

capacity. 2 Hard Glass Retorts, 4-02. and 12-oz.

i Hard Glass Flask, 10-oz. capacity. capacity.

1 Pipette or Dropping Tube. 2 Hard Glass Receivers, 4-oz. and 12-oz. 1 Woulffe's Bottle with three decks, for capacity.

washing Gases, &c. 1 Spirit Lamp with single jet, 2-oz. capacity. 1 Spoon with Cap, for Charcoal, Sulphur, 2 Yard Glass Flasks for bolling, 4-oz. and &c., when deflagrated in Oxygen. 8-oz. capacity.

3 Bobernian Beaker Glasses for Hot Solu1 Hard Glass Flask with jet for washing tions, 4, 6, and 10-oz. capacity.

precipitates, 12-oz. capacity, or for burning i Metal Spirit Lamp with double current Hydrogen as generated, or as Marsh's and arms to support sand-bath, dishes, Arsenic Apparatus.

crucibles, with Hot Plate and 2 rings. 2 Gas Cylinders with ground edges.

Where Gas is obtainable a Bunsen's Gas 2 Ground Glass Plates for the Cylinders.

Lamp with Arms and Rings may be sub3 Bottles to hold gases.

stituted for the Spirit Lamp above-men1 Hard Glass Tube for preparing Oxygen

tioned. Gas.

1 Thistle-beaded Glass Safety Funnel to in1 Test Tube Stand with 12 holes.

troduce Acid in the preparation of Gases. 12 Test Tubes, each 5-in. long.

1 Chloride of Calciam Tube for drying Gases. 1 Test Tube Cleaner.

1 Berzelius' Blowpipe with moveable Pla2 Analytical Glass Funnels for Filters.

tina jet, to prevent Oxidation, and Horn1 Brass Blowpipe.

mouthpiece (instead of Brass Blowpipe 1 Tripod to support a sand-bath or flask for

as contained in former set). digestion, or retort for distillation.

1 pair of Crucible Tongs. 2 Wire Triangles for tripod.

Sheet of 100 Re-agent Labels with Symbols. 2 Iron Dishes for sand-baths, 4-in, and 5t-in. diameter.

THIRD SET.-50s. 3 Porcelain Evaporating Dishes, 24, 3t, and 4-in. diameter.

Packed in a Case, 52s. 3 Porcelain Crucibles, and Covers, and Includes the Second Set with the

1-oz. capacity. 3 Hessian Crucibles, t, 1, and 2-ozs. capacity.

following additions. 1 Mortar and Pestle.

1 Box of Scales and Weights, with glass pans. 3 Cork Borers for perforating Corks.

1 Graduated 2-oz. Glass Measure. 12 Assorted Corks for Flasks, Tubes, &c. 1 Gas Receiver, 20-0z. capacity, with brass 1 Round File for enlarging holes in Corks. cap, stopcock, bladder-ferrule and jet, for 1 piece of Wire Ganze.

holding or conveying Gases into Bladders, 1 ditto of Platina Foil.

Balloons, &c. 1 ditto of Platina Wire.

1 Pneumatic Trough, 1-gall. i ditto of Copper and Zinc, united, for Gal- i Thermometer, graduated on stem to 400° vanic depositions.

Fahr., to pass through corks into flasks, 1 Iron Spoon for Fusions.

&c., in Wood Case. 2 Glass Stirring Rods.

2 Hydrometers for ascertaining the density 3 Tubes for the reduction of Arsenic accord- of fluids, taking 1000 grains of distilled

ing to the forms of Berzelius, Clark, and water at 60° Pahr. as standard, one for Rose.

fluids lighter than water, as spirits, &c., 2 Bent leading Tubes for fitting up Flasks, 700° to 1000°, one for heavier fluids, 10000 &c., for preparing Oxygen, Hydrogen, and to 1850°.

1 Solution Tube for holding the fluids for 8 Bent and other Tubes for leading and Hydrometer during immersion. washing Gases, also as Syphons.

i Graduated Test Measure, 1000 grains in A piece of Wood Charcoal for Blowpipe.

100 divisions.

other gases.

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