The prints collection, recently catalogued by the Making Prints Public project, includes a significant number of illustrations (etchings, engravings and lithographs) taken from eighteenth- and nineteenth-century periodicals and magazines. The majority come from the Universal Magazine (1747–1814) and the Gentleman’s Magazine (1731–1907).The history of science is also with the history of the journal, as in the case of the Philosophical Transactions. A strict distinction between popular and professional did not exist, science was not disseminated by experts to a more general reading public.
In the eighteenth century, quarterly issued periodicals were literary and substantial. Aspects of scientific, medical and technological culture, including new technologies and inventions, portraits of scientists, and natural phenomena were represented. Genres within the periodicals market included cheap miscellanies, religious monthlies, satire and caricature, shilling monthlies, juvenile magazines, and biography, and scientific content could be found in all of them. Illustrations, in etching or engraving, were often of quite a high quality, particularly in publications such as the Illustrated London News.
During the Napoleonic wars (1799-1815) taxes on knowledge and the cost of paper had made magazines expensive (about 2s). In the post war period, the sixteen page octavo format at a cost of 1d became commonplace, aided by the invention of the stream press and the lifting of taxes on knowledge. New techniques of wood engraving, including end-grain, were developed and particularly used in this format for illustrations. Illustrations were often serialised and repurposed from one publication to another.
Scientific material was dispersed within fictional, satirical and political articles. Content was sourced from longer monthly magazines, further expanding the readership for those magazines towards women, children, and middle class professional men, with backgrounds in manufacturing, finance, engineering and trade.
Editors and readers contributed to shaped discussion and reception of scientific theories and discoveries. Darwinism and other developments in science were circulated not only in fact based articles but in fiction and poetry to become topical talking points. There were writers who were also scientists, such the natural philosopher, journalist and biographer of Newton, David Brewster (1781–1868), who contributed to the Edinburgh Magazine and the Scots Magazine from 1799 to 1802. He became joint editor of the Edinburgh Philosophical Journal in 1819 with the mineralist Robert Jameson. Brewster’s articles were serialised all over the United Kingdom in general publications. Brewster’s work can be seen in Inv. No. 13490 Print (Engraving, Colour-Printed) Containing Two Meteorological Hemispheres or Planispheres Entitled ‘Map of the Lines of Equal Polarization in the Atmosphere’, by Sir David Brewster, Engraved and Printed by W. and A. K. Johnston, Edinburgh, 1854 
Further reading and sources:
G.N. Cantor (ed) Science in the nineteenth-century periodical: reading the magazine of nature (Cambridge, 2004)