Note 59 — Chapter III · THE POSSIBILITIES OF AGRICULTURE.

I saw thermosiphons used by the market-gardeners at Worthing. They said that they found them quite satisfactory. As to the cost of heating the soil, let me mention the experiments of H. Mehner, described in Gartenflora, fascicules 16 and 17 of the year 1906. He considers the cost quite small, in comparison with the increased value of the crops. With £100 per Morgen, spent for the installation, and £10 every spring for heating, the author estimates the increase in the value of crops (earlier vegetables) at £100 every year. (Report to the German Landwirthschafts Gesellschaft, 1906.)