The Garden Under Glass

GLOSSARY 347 Bog-peat.—This is so named to distinguish it from the upland peat which is found on higher levels. For general greenhouse purposes the upland peat is preferable, as it is more fibrous. Bog-peat cannot be recommended for orchids. . . Boilers—These are the furnaces combined with cavities in which water is heatcd and ma.de to circulate through pipes in the greenhouse. There are so many types of boiler that it is very difficult to choose between them. Amateurs, however, would be well advised to have either a small upright boiler or a sectional one. Illustrations and prices may be obtained from firms advertising in the gardening papers. It is essential that the flues of a boiler be kept clear and that the boiler itself be flushed out each autumn. Soft water is advised for use in boilers. Bottling.—The only bottling which directly concerns us as gårdeners is the storing of grapes in bottles. A few remarks on the subject will be found on page 163. Bottom Heat.—It is often found necessary for successful growth that the temperature of the soil exceeds that of the atmosphere. In such a case means must be taken to give heat below the surface. This is usually done by running the hot-water pipes beneath, as in a propagator or a melon-house, but bottom heat may also be obtained by means of strawy horse manure and leaves formed into a hot bed. How to make a hotbed has been described on page 193 • Box Frame.—A wooden frame formed like a box. It has the advantage over pits that it can be moved from place to nlace. Thus if during the winter it has been she]tering sweet-peas in pots, it may be removed in March without disturbing the plants and be set over antirrhinums just pncked off. In MayPit may be used for covering heliotropes and afterwards for setling over a hotbed and growing cucumbers. Box to.—To place plants in boxes, such as when seedlings are pricked. Useful sizes for boxing are 30 mches by 12 or 24 by 15. I much prefer the latter figures. The inside