Is quite prepared to contribute an article on Light by 1830 for DL's Cyclopaedia. Would like William Whewell as the contributor on Sound. Suggests other names. Would not like to use colored plates as they are so poor. Gives him an idea of the style of engraving.

Is now prepared to write a signed article on light requested by DL [see JH's 1828-7-25]; JH encourages DL to ask William Whewell, W. H. Fitton, and George Peacock to write as well; recommends against use of color printing of pictures as the reproduction is too poor.