Name
- Haynes, Thomas1
- Henry, William, of Add MS 339801
- Hepworth, Captain1
- Herriott, Charles1
- Heuser?, King's Contmissary of the Royal Society of Agriculture of Paris1
- Hincks, Thomas D-, Secretary of the Cork Literary and Philosophical Society1
- Hitchins, Malachy1
- Hogg, William1
- Holder, Henry Evans, Reverend1
- Holland, Owen, of Add MS 339771
- Hope, Alexander, of Add MS 339821
- Hope, John, Professor of Botany at Edinburgh1
- Hope, John, of Add MS 339771
- Hynam, Robert1
- Incola Orcadensis, pseudonym, of Edinburgh1
- Inglis, Hugh, 1st Baronet, Chairman of the East India Company, 1744-18221
- Jacobi, Christian Friedrich, Secrétaire de la Société des Sciences, Copenhagen1
- Johnson, R- A-1
- Johnston, Alexander1
- Johnstone, J-, of Add MS 339801