Such is the evidence for concluding that the custom of receiving children for education in nunneries was widespread. It remains to consider carefully the limitations within which this conclusion is true. In the first place, not all nunneries received children. It is obviously impossible, considering the gaps in our evidence, to attempt an exact estimate of the proportion which did so. Some sort of clue may be obtained by an analysis of the Yorkshire visitations of Archbishops Greenfield and Melton at the beginning of the fourteenth century (1306-20) and of Alnwick's Lincoln visitations (1440-5). The Yorkshire evidence is rather scanty, being based on the summaries of injunctions, which are given in the _Victoria County Histories_, and any statistics must needs be approximate only. The two archbishops between them visited nineteen nunneries and mention of children is made at twelve, i.e. about two-thirds. The information given by the invaluable Alnwick is more exact. From the _detecta_ of some of the nuns and from the number of prohibitions of this practice, it is obvious that Alnwick was accustomed to ask at his visitations whether children were sleeping in the nuns' dorter; he also made careful inquiry as to the boarders. The probability, therefore, is that we have in his register an exact record of those houses in which children were received. Analysis shows that of the twenty houses which he visited he found children, often boys as well as girls, at twelve, i.e. a little over two-thirds, which is substantially the same result as was given by the Yorkshire analysis a century earlier. The estimate is interesting, but it cannot be considered conclusive without the corroborative evidence from other dioceses, which is unfortunately lacking. It is a hint, a straw, which shows which way the wind of research is blowing, for if it is unsafe to argue from silence that the nuns of other convents did take pupils, it is equally unsafe to argue that they did not.