Letter XI
"these tumultous motions" changed to "these [tumultuous] motions"
Letter XII
"one [antennæ]" unchanged.
"reside in them," changed to "reside in [them.]"
Appendix
"the cirumference is edged" changed to "the [circumference] is edged"
"he could have proportioned the tortous canal" changed to "he could have proportioned the [tortuous] canal"
"pressed between the laminae" changed to "pressed between the [laminæ]"