I also found this one:
"You will please accept my thanks for the favor of Mr. Spooner's book upon "The Trial by Jury." I have derived much pleasure from a hasty perusal of it, and hope the author will persevere and produce other works, of which he has given indications in this. Although I do not look to see his theories extensively carried out in practice, yet I think his labors must have effect for good. Investigations so decidedly able and searching, can scarecely fail to excite reflection and serious enquiry, as well with honest legislators and statesmen, as among enlightened jurists. And this result may be, at least, a step taken towards restoring to suitors some of those common-law rights, of which, in the lapse of centuries, they have been gradually deprived." - Stephen Royce, Governor of Vermont (note: the essay to which he refers was a follow-up to the Unconstitutionality of Slavery that was published along with it in subsequent editions)