LIME deficiency is generally recognised as one of the main factors causing poor crop yields, but unfortunately in too many cases little or no attempt is made to remedy matters. This is partly due to a failure to realise the considerable improvement that is likely to be made by a judicious lime application, and partly to a lack of knowledge as to the best and most economical materials to use. The author has endeavoured to outline the problem in the simplest manner, emphasising the need for lime in both plant and animal nutrition, and supporting his remarks by reference to the results of modern research work. A very useful feature is a descriptive list of the various forms in which lime may be applied, as the expenses of carriage usually compel the use of the nearest source of supply. The benefits that crops derive from adequate lime are given, but no mention is made of the effect of chalk on heavy land in reducing the resistance offered to the passage of cultivation implements. On the animal side, the nutritive requirements of various classes of stock for lime are considered, together with the sources of supply, as milk, hay, and green fodders, meat and bone meals and fish meals.