The _Regimen_ conveyed a deal of information in compact form. It gives the number of bones in the body as 219 with 32 teeth, and the number of veins as 365, this number being chosen doubtless because of some supposed relation to the number of days in the year. It contains also a good brief account of the four humours in the human body--black bile, blood, phlegm, and yellow bile; and of the four temperaments--the sanguine, the bilious, the phlegmatic, and the melancholy. These four temperaments were discussed at considerable length by all the psychologists and most of the writers on religious life for centuries afterwards, largely on the basis of the information conveyed by the Salernitan handbook. There are descriptions of the symptoms of plethora or excess of blood, of excess of bile, of excess of phlegm, and excess of black bile. The little volume finally contains discussions as to bleeding, its indications, contraindications, as in youth--"Ere seventeen years we scarce need drawing blood"--and in old age; and then of the mode of practising it, and the place whence the blood should be drawn to relieve different symptoms.[5] Salerno impressed itself much more deeply on surgery than on medicine, for the magnificent development of medieval surgery, the knowledge of which has proved so surprising in our day, began down at Salerno. Some of the details of this phase of Salernitan accomplishment are given in the chapter on Medieval Surgeons of Italy. Roger and Roland and the Four Masters were great original founders in a phase of medical science that proved extremely important for the next three or four centuries. Undoubtedly the presence of a hospital at Salerno, where there were gathered a number of the chronic cases from all over Europe, most of them of the better-to-do classes looking for ease from their ills, gave the incentive to this development. When the natural means of cure, tried for a considerable time, failed, recourse was had to surgery for relief, and often with excellent results. This chapter on Salerno's history shows how thoroughgoing was the effort of the members of the faculty of the medical school to develop every possible means of aid for their patients, even when that required pioneer work. Pagel's appreciation of Salerno's place in the history of medicine, in his chapter on Medicine in the Middle Ages in Puschmann's "Handbuch Der Geschichte der Medicin," Berlin, 1902, gives in very brief space a summary of what was accomplished at Salerno that emphasizes what has been said here, and his authority will confirm those who might possibly continue to doubt of any institution of the Middle Ages having achieved so much. He said: