My dear Mr. Sinnett,
Your invitation read with surprise.
Not "surprise" at myself being invited, but surprise at you inviting me again, just as if you had not had enough of me! Now what good can I be to any one in this world, except to make some stare, others to speculate upon my cleverness as an impostor, and the small minority to eye me with the feeling of wonder generally in store for "monsters" exhibited in museums or aquariums. This is fact; and I had enough proof of it, not to run again my neck into the halter if I can help it. My coming to stop with you even for a few days, would be only a source of disappointment to yourself, and one of torture to me.
Now, you must not take these
en mauvaise part means "in a bad sense". Sinnett should not take it ill that HPB is turning down the invitation.
pour mes beaux yeux means "for my beautiful eyes".
C.S. indicates a British Civil Servant.