Treatise eminently practical and made for consultation in the field, as it were, by the sixteenth century bleeders that composed by Dr. Francisco Molina. He himself refers to his treaty with the term “obrecica”.
The justification for the need of his writing is offered by the author in his preface to the reader: "Moved with much desire to avoid bloodshed, as in these parts is our every intention, to curb misuse and prompt seriously wills that barbers have in ordering his conscience to advise unlicensed medical expertise to ignorant people; they treat them nowadays in order to make themselves appreciated and show that they can do something pretending they repair human bodies but destroying them completely, and because those who act in another way are more responsible, not being able of avoiding ignorance; everybody having this book where I was able to compile and declare the intention of what doctors have told have or do or ordering the bleedings".
At the colophon, after insisting on those who this work is aiming for, as it has been written "for the well being and use of the ill, and for barbers', surgeons' and anybody's who cuts body parts, instruction: The General Vicar in Alcala de Henarés, dioceses de Toledo, the graduated Pedro de Lagasca has given his approval".
We have 1 facsimile edition of the manuscript "Tractado muy provechoso del anatomia, y phlebotomia... ": Tractado muy provechoso del anatomia, y phlebotomia de venas y arterias y del anatomia de los nervios, con un tractado de ventosas y otro de sanguijuelas con unas reglas generales para saber los dias aptos para las sangrias facsimile edition, published by Vicent Garcia Editores, 2012