Over the preceding chapters we have seen the ways in which medical trade companies and doctors worked together for mutual benefit to design and produce a catalogue that was both useful to late nineteenth- and early twentieth-century medical practice and acceptable to a consolidating professional readership. Companies, as the catalogue's, primary authors, viewed the publication as essential for maintaining and developing relationships with doctors during a period of both economic growth and market uncertainty. Influenced by the requirements of their readership both before and after the act of composition, companies balanced their desire for profit with the ethical considerations of the medical profession; they excluded non-medical professional readers and Shaped their catalogues into medical reference books, a publication with which all practitioners were familiar and which they had long deemed crucial for the dissemination of new forms of medical knowledge. Doctors' general acceptance and use of the catalogue suggests that companies succeeded in satisfying professional mores; they were willing readers of the publication and consumers of the tools promoted within them, but also played a vital and active role as authors in directly shaping the form and content of catalogue through suggestions, testimonials and their own designs of new medical tools and apparatus.