I was honoured with your last in due time; and found in it, as in all your former, new motives of gratitude and acknowledgment. I hope it will scarce be necessary to tell you, how sensibly your accumulated favours and those of Mr. Spence affect me. Were expression the only means of discovering what we feel, the most refined sentiments of which the human heart is capable, would often be either quite suppressed, or appear with great disadvantage. But a benefactor, who obliges from disinterested generosity, will anticipate the feelings of those on whom his favours are bestowed, and save them the confusion of a task to which they are rarely equal. — The honour which Mr. Spence has done me is now pretty generally known in Edinburgh, and 'tis probable there may be a quick demand for the performance. The arrival of more copies is already impatiently expected; but, till the 50 which you mention are dispersed, it may not, perhaps, be so proper to increase the number.