"[Nalanda university] had ten thousand students, one hundred lecture- rooms, great libraries, and six immense blocks of dormitories four stories high; its observatories, said Yuan Chwang, "were lost in the vapors of the morning, and the upper rooms towered above the clouds." The old Chinese pilgrim loved the learned monks and shady groves of Nalanda so well that he stayed there for five years. "Of those from abroad who wished to enter the schools of discussion" at Nalanda, he tells us, "the majority, beaten by the difficulties of the problem, withdrew; and those who were deeply versed in old and modern learning were admitted, only two or three out of ten succeeding."" The candidates who were fortunate enough to gain admission were given free tuition, board and lodging, but they were subjected to an almost monastic discipline. Students were not permitted to talk to a woman, or to see one; even the desire to look upon a woman was held a great sin, in the fashion of the hardest saying in the New Testament. The student guilty of sex relations had to wear, for a whole year, the skin of an ass, with the tail turned upward, and had to go about begging alms and declaring his sin. Every morning the entire student body was required to bathe in the ten great swimming pools that belonged to the university. The course of study lasted for twelve years, but some students stayed thirty years, and some remained till death." The Mohammedans destroyed nearly all the monasteries, Buddhist or Brahman, in northern India. Nalanda was burned to the ground in 1197, and all its monks were slaughtered; we can never estimate the abundant life of ancient India from what these fanatics spared."