Copy of draft letter, from Sir John Herschel to Thomas Maclear, dated at [Collingwood] Copy of draft letter. States the case for the accuracy of the observations and reports of the discoveries of the sixth and seventh satellites of Saturn made by John Frederick William Herschel's father, William. [This letter seems to be tied to John Frederick William Herschel's 1844-7-22 in terms of date of writing.] 1844