One of my favourite books for browsing when I have a few hours to spare is my Concise Household Encyclopedia from around 1930 (as with so many books of this era, it is undated). I simply adore the wide range of articles. I love the illustrations and house plans which make me think of the beautiful country houses on the further reaches of Metroland in the Chilterns countryside.
Amongst the household essentials - cooking, mechanics, managing servants, sewing, etc - and a few interesting craft articles - making artificial flowers, bag making, barbola work, leatherwork, metalwork - is an article that makes the hairs on the back of my neck stand up.
Makes one wonder whether any small furry within several miles of this book was safe!