I have had a Visitation of my old Enemy the Vertigo. It is periodical, & continuous every Year, thro’ February & March, less or more vindictively, accordingly as good or bad Luck attends me; No Care or Attention will repel it entirely. It has been very oppressive & destressing to me. I am getting the better of it; but it retreats sourly. I should have acknowledged the Receipt of your Favour of the last of January, sooner, but for this embarrassing State of Pericranium. I cannot now satisfy myself on the Points you say you shall differ with me in.