That the primary requisites for tree growing are the physical characteristics of all soils favorable for that purpose requires no discussion. The successful nut tree planting starts with the soil, whether it be on the scale of an orchard, grove, or just a few trees around the farm or garden. The better soils for general crop production are on limestone, basalt, dolemite, dolerite, diorite and gabbro formations, whereas sandstones, aplites, granites, pierre shale, cretacious rocks and volcanic formations weather into inferior soils. Gneiss can be sometimes good, sometimes unfavorable for building of fertile soil. It is well to bear in mind that geology and botany are our two fundamental sciences, and that all our other sciences are in reality departments of these. Chemistry can be either a branch of botany if it deals with organic chemistry, or else a branch of geology, if it deals with inorganic chemistry, and it would appear that the modern scientific grower of nut trees or any other crops is wittingly or unwittingly concerned with both. Biology and zoology both are branches of botany. The Essential Elements In the past, economics have governed any crop production, whether of trees, grains, fruits or vegetables; not nutrition and health. The future in all likelihood will demand improved crops from the standpoint of nutritional purposes as foods. It is gradually being realized that the production of better crops can be brought about by greater application of essential nutrients to soils or as nutritional sprays direct to trees, and that such practices also reflect true economics. The same principle should govern wood production. According to our today's knowledge, there are at least nineteen elements invariably essential to life, viz: Primary: Hydrogen, carbon, nitrogen, oxygen, phosphorus. Secondary: Calcium, magnesium, sodium, potassium, iron, sulphur, chlorine. Micro: Manganese, copper, boron, silicon, aluminum, fluorine, iodine. Then there are another eighteen elements at least variably necessary to life, viz: (1) Variable Secondary Elements: Zinc, titanium, vanadium and bromine. (2) Variable Micro-Elements: Lithium, rubidium, caesium, silver, beryllium, strontium, cadmium, germanium, tin, lead, arsenic, chromium, cobalt and nickel. Elements in Soils Essential for Plant Growth It is furthermore safe to state at the present time that fertile soils should contain at least the following twenty elements: Nitrogen, phosphorus, potassium, calcium, magnesium, sulphur, hydrogen, carbon, oxygen, iron, sodium, chlorine, aluminum, silicon, manganese, copper, zinc, boron, iodine, and fluorine. Until quite recently many scientists believed that only the first ten elements were necessary for growth and maturing of crops; that only the first three should be considered as fertilizer ingredients, and that the others were supplied by soil, air and water, or were present as natural fillers in manures and fertilizer raw materials.