James Jennings was the son of a substantial grocer of Huntspill in Somersetshire; he was apprenticed to a chemist in Bristol, where he was an early acquaintance of Robert Southey. He carried on the family business before migrating to London in 1817, where he edited journals and was secretary to the Metropolitan Literary Institution.
The times, a satirical rhapsody. 1794.
Poems, consisting of Mendip, the magic ball, sonnets, retrospective wanderings, and other pieces. 1810.
The Prospects of Africa, with other poems. 1814.
The family cyclopaedia; being a manual of useful and necessary knowledge. 2 vols, 1821.
A lecture on the history and utility of literary institutions: delivered at the Surrey institution, London. 1823.
Observations on some of the dialects in the West of England, particularly Somersetshire. 1825.
An inquiry concerning the nature and operations of the human mind, in which the science of phrenology, the doctrine of necessity, punishment, and education are particularly considered. A lecture delivered at the Mechanics' Institution, London. 1827.
Ornithologia, or, The birds: a poem, in two parts; with an introd. to their natural history; and copious notes. 1828.
The pleasures of ornithology: a poem. 1828.
A practical treatise on the history, medical properties, and cultivation of tobacco. 1830.