THE MISSING DROP: THE CALLING FOR THE MEMORY OF WATER is a book that reviews scientific materials available on the internet in order to immerse the reader into the deep ocean of knowledge development in which each drop of water is fundamental for the assimilation and understanding of the matter addressed. Through a systematic approach, the basic concepts of the studied subject are described, portraying the facets of the memory of water in the realmof the homeopathy andthe electromagnetic field. At the end, is described the application of this content in the agricultural sector and finally, one scientific article published by the authors of this book are made available to complement the studies presented.