The Garden Under Glass

AN EPITOME OF VINE CULTURE 163 and as this advances towards 6o° the top ventilators may be slightly opened, so as to keep the heat between 550 and 6o°. Whenever the weather clouds over the ventilators must be closed, and be reopened at the outbreak of Sunshine. This may occasion a good deal of ninning about, but if good grapes are to be grown it is the only way. The reason, of course, is that fluctuations of temperature must be avoided as causing checks, and thus being inimical to good growth. In the early stages of growth no front air must be admitted until the leaves have well expanded, nor should the house be lef t open during the night. As the sun begins to warte during the afternoon the house must be syringed and shut up in order to bottle up the sun-heat, which is always to be preferred to that caused by a fire. It may happen, of course, that on duil days no ventilation will be needed. As the season advances and the vines grow more Ventilation will be needed, the time of opening the lights will be earlier, and of closing them later. In the height of the season air may have to be admitted at six a.m., but it will always be safe to close by live p. m. Front air is usually regarded as supplementary to top ventilation, and besides being put on later is also taken off earlier. When ripening is completed a full supply of air is essential. When the fruit has been cut off all possible air may be admitted, and unless there are other plants in the house there is no need to keep out the frost, although a slight circulation of heat must at such times be run through the hot-water pipes to keep them from freezing and bursting. Storing Grapes in Bottles Few amateurs probably grow so many grapes that they have to store them. But it may happen that they want