Greenhouses, their construction and equipment . rial-ly during the past 30 years. AREA UNDER GLASS IX THE UNITED STATES AND TENPRINCIPAL STATES. FROM CENSUS REPORTS 1910 1900 1890 Tot. Glass Greenhses Tot. Glass Greenhses* Tot. Glass sq. ft sq. ft. sq. ft. sq. ft. sq. ft. 114,665,276 105,165,730 96,230,420 80,544,862 38,823,276 111. 15,950,853 14,380,857 8,744,020 7,318,744 3,236,750 N. Y. 15, 13,878,875 13,635,440 11,412,863 6,947,289 Penn. 13,846,672 12,887,672 11,819,610 9,893,013 6,066,144 N. J. 8,840,511 7,984,752 11,190,250 9,356,283 3,703,554 Ohio 7,583,562 7,091,976 7,970,1
Greenhouses, their construction and equipment . rial-ly during the past 30 years. AREA UNDER GLASS IX THE UNITED STATES AND TENPRINCIPAL STATES. FROM CENSUS REPORTS 1910 1900 1890 Tot. Glass Greenhses Tot. Glass Greenhses* Tot. Glass sq. ft sq. ft. sq. ft. sq. ft. sq. ft. 114,665,276 105,165,730 96,230,420 80,544,862 38,823,276 111. 15,950,853 14,380,857 8,744,020 7,318,744 3,236,750 N. Y. 15, 13,878,875 13,635,440 11,412,863 6,947,289 Penn. 13,846,672 12,887,672 11,819,610 9,893,013 6,066,144 N. J. 8,840,511 7,984,752 11,190,250 9,356,283 3,703,554 Ohio 7,583,562 7,091,976 7,970,190 6,471,049 2,785,192 Mass. 7,382,009 6,817,585 8,710,280 7,290,504 2,717,946 Cal. 5,087,132 ,423 1,572,480 1,316,165 Mich. 4,122,099 ,772 2,593,230 2,170,233 1, Mo. 2,812,221 2,545,138 3,126,400 ,786 1,240,093 Iowa 2,183,182 1,870,840 1,436,260 1,202,149 Ky. 1,163,241 Conn. 1,060,920 ?Estimated. CHAPTER IISASH-BED CONSTRUCTION HOTBEDS As stated in the preceding chapter, hot-beds are low structures almost wholly under-. Fig. 1.—Hotbed in operation ground, but having a glass roof made up ofsash. They are usually heated by ferment-ing horse manure placed in the bottom, butmay be heated by brick or tile flues, or bysteam or hot water. Their chief commercialuse in for the starting of early vegetable andflowering plants. In the home garden theymay be used for growing to maturity in earlyspring or late autumn, such semi-hardy and 10 SASH-BED CONSTRUCTION 11 quick maturing vegetables as radishes andlettuce, and thus extend the season for sev-eral weeks or even months. They may alsobe used for starting and protecting early inthe season, other slower growing crops suchas melons, which are not transplanted but areallowed to mature in the beds. A gain ofseveral weeks may thus be secured in thetime of ripening. Well constructed and pro-tected hotbeds will withstand a temperatureas low as zero if it is of short duration. Location.—The location for the hotbedshould
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