Nov. 29.] THE NEW ZEALAND GAZETTE. 3039

Use of the measuring-glass and the pipette. Flotation. The hydrometer. Verification of the principle of Archimedes. How to find the relative density of solids and of liquids.

Use of the U tube. Method of comparing the densities of two liquids that do not mix and of finding the density of a liquid that mixes with water. How to make a barometer. Use of the barometer. Verification of Boyle’s law.

Centre of gravity. Methods of finding its position in very simple cases. Stable, unstable, and neutral equilibrium.

Like parallel forces. Experimental determination of the resultant of like parallel forces. Experiments illustrating the principle of moments. Experimental determination of the resultant of two forces acting at a point in different directions. Simple experiments to determine friction between two plane surfaces in contact. The coefficient of friction. The three systems of levers. Single pulleys. The inclined plane. Mechanical advantage. Such simple experiments illustrating elasticity as may be made with steel wire or indiarubber cord. Comparison of the amounts of flexure produced by a given weight in rods of different size and material. Experimental verification of the law of the simple pendulum.

The expansion by heat of solids, liquids, and gases. The expansion of different solids and liquids compared. The thermometer. Points to be attended to in using and reading the thermometer. Change of density due to change of temperature. The special case of water. Conduction, convection, and radiation. The conductivities of different substances compared. How to determine the melting-point of a solid and the boiling-point of a liquid. Effect of pressure on the boiling-point. Observation of the temperature of a substance during change of state. Effect of mixing two quantities of the same liquid at different temperatures. The use of the calorimeter (simple form). The determination of the specific heat of a solid and of a liquid. The latent heat of water and of steam.

(26.) Elementary Practical Agriculture.—Before undergoing the written examination in this subject, the candidate will be required to furnish a certificate showing that he has satisfactorily completed an approved course of instruction in practical agriculture. In the written tests he will be expected to show (a) that he has a practical knowledge of the operations incident to the work of a school garden, and (b) that he has conducted experiments and observations bearing on the life and growth of plants, on the lines indicated below under the head of experimental and observational work:—

(a.) Work in the garden.—General: Preparation of the land; digging, trenching, hoeing, raking, and surface cultivation. Drawing drills. Sowing. Thinning, pricking off, hardening, and planting out seedlings. Methods of treating light and heavy soils. Fertilisers; the time of year and the condition in which to apply fertilisers. The selection of fertilisers for particular purposes. Use of lime, soot, clay, road-sweepings, ashes, leaf-mould, &c., as soil-improvers. Arrangement of the garden to the best advantage from the points of view of space, succession of crops, and weeding. The application of preventives and remedies for garden pests and diseases.

Special: Methods of plant-cultivation. Cultivation and management of plants selected from one or more of the following groups:—

(i.) Green, pod-bearing, and tap-rooted vegetables, potatoes, onions, vegetable marrows, tomatoes. Gathering and storing of vegetables.