The prospectus of the Dictionary he addressed to the earl of Chesterfield.
See Diderot's Prospectus (Muvres, iii.) and d'Alembert's Discours (Ouvres,i.) The scheme should be compared with later attempts of the same nature by Ampere, Cournot, Comte and Herbert Spencer.
He determined, therefore, to publish his paper in Boston, and, having issued his prospectus, set himself to the task of awakening an interest in the subject by means of lectures in some of the principal cities and towns of the North.
Shortly afterwards (1860) he sent out the prospectus of a systematic exposition of his Synthetic Philosophy, of which the first volume, First Principles, appeared in 1862.
In 1786, supported also by such scholars as Benjamin Kennicott and Robert Lowth, Geddes published a Prospectus of a new Translation of the Holy Bible, a considerable quarto volume, in which the defects of previous translations were fully pointed out, and the means indicated by which these might be removed.