_Hornbooks_ (Vol. ii., p. 167.).--Mr. Timbs will find an account of hornbooks, with a woodcut of one of the time of Queen Elizabeth, in Mr. Halliwell's _Notices of Fugitive Tracts_, printed by the Percy Society, 1849. Your readers would confer a favour on Mr. Timbs and myself by the communication of any additional information. R. _Passages from Shakspeare_ (Vol. ii., p. 135.).-- _Ang._ We are all frail. _Isab._ Else let my brother die, If not a feodary, but only he Owe, and succeed thy weakness. _Ang._ Nay, women are frail too. _Measure for Measure_, Act. ii. Sc. 4. I should paraphrase Isabella's remarks thus:-- "If it be otherwise, if we are not all frail as thou sayest, then let my brother die, unless he be but in the same case as others; if he alone possess and follow thee in that particular frailty to which thou has half confessed." A feodary, I should observe, was an officer of the Court of Wards, who was joined with the escheator and did not act singly; I conceive therefore that Shakspeare by this expression indicates an associate; one in the same plight as others; negatively, one who does not stand alone. In _Cymbeline_, Act iii. Sc. 2., we read: "Senseless bauble, Art thou a _feodary_ for this act, and lookst So virgin-like without?" where feodary clearly means confederate, associate. According to some, the word signifies one who holds land by the same tenure as the rest of mankind; whilst Mr. Knight, in a note on _Henry IV_. Part i. Act i. endeavors to show that it includes both the companion and the feudal vassal. "To owe" is frequently used by Shakspeare in the sense of to possess, to own, as in Act i. Sc. 5. where Lucio says: "But when they weep and kneel, All their petitions are as freely theirs As they themselves would _owe_ them." So also in the following instances:-- "The slaughter of the prince that _ow'd_ that crown." _Richard III._, Act. iv. Sc. 4. "What art thou, that keepst me out from the house I _owe_?" _Comedy of Errors_, Act iii. Sc. 1. "Then thou alone kingdoms of hearts shouldst _owe_." _Sonnet_ lxx. Further examples will be found in _A Lover's Complaint_, the last line but two; _Pericles_, Act v. Sc. 1.; _Twelfth Night_, Act. i Sc. 5., _Love's Labour's Lost_, Act i. Sc. 2.; _King John_, Act ii. Sc. 1.; _King Lear_, Act i. Sc. 4. As the passage is allowed to be obscure, this attempt to explain its meaning is submitted with great deference to the opinions of your readers. Arun. _Mildew in Books_ (Vol. ii., p. 103.).--In answer to B. I mention that the following facts connected with mildew in books have been elicited. The mildew referred to is that which shows itself in the form of roundish or irregular brown spots. It is usually most abundant in those parts which are most exposed to the air.