Page 129. " There is cold ham and cold tongue "
Beef Tongue
Creative Commons Attribution Share AlikeBeef Tongue - Credit: Charles Haynes

"Cold tongue" is beef tongue, which is widely eaten in various cultures around the world (Mexican, Filipino, Russian, etc.), although it is now much less commonly enjoyed in England.

Page 130. " there are white horses on the sea "
Creative Commons Attribution"White horses on the sea" - Credit:

"White horses" are white caps, or waves with white foam on top.

Page 136. " I agree that one of us is possessed by a devil. "

Emily Brent once again shows her fondness for allusions to Scripture.

Devil possession--or, more accurately in today's language, demon possession--is referred to numerous places in the New Testament, including Matthew 8, 9, 10, 11, 12, 15, and 17; Mark 1, 3, 5, 6, 7, 9, and 16; Luke 4, 8, 9, 10, 11, and 13; and John 7, 8, 10, and 13.

Page 146. " I wanted to test the possibilities of heliographing to the mainland. "

Creative Commons Attribution Share AlikeHeliograph - Credit: Goran Zec
 Heliography is the use of mirrors to reflect the sun for communication over distances.