Cattle manure, bones, oil-cake and fish constitute the manures mainly used in Coorg. The first is universally recognized as being the most valuable for coffee, but the supply available in the Bamboo district (which contains, I may remind the reader, 20,000 out of the 32,323 acres under cultivation by Europeans), where grazing is scarce, is so small that planters have to depend to a great extent on the three last-named manures. Messrs. Matheson & Co., the owners of about 7,000 acres of coffee in Coorg, kept for some years in their employ an analytical chemist,[49] whose time was devoted to the analysis of soil, and the making of experiments on their estates, with the view of ascertaining what was best adapted for maintaining and improving their fertility. Salts of various kinds were experimented with, but, though the results from them were generally favourable, they were found to be too rapidly soluble for a climate so subject to heavy falls of rain. In the end, after many experiments, he came to the conclusion that the four above-mentioned manures were the best for the climate, and that the proportion applied should vary with the condition of the coffee. To illustrate this point I may add that in Coorg, bones and oil-cake are usually applied in the proportion of two of the latter to one of the former. If, however, a field has suffered badly from leaf disease (which destroys many of the leaves), or is not making wood as rapidly as it ought, it is customary to apply a larger proportion of oil-cake, or in some cases, to put down that manure without adding any bones. On the other hand, if there is a superabundance of wood, and it is desirable to throw the whole energies of the tree into the production of berries, then the proportion of bone manure is increased and that of oil-cake diminished.