Henry Sweet (1845-1912) was an influential English philologist, phonetician, and grammarian, whose work in the field of linguistics left a lasting impact on the study of English. His contributions to the study of the sounds of English led to the development of phonetic transcription systems that have been instrumental in the teaching of English as a second language. Sweet's understanding of language was comprehensive, but he is particularly known for his work in the Germanic languages, as evidenced by his book 'Icelandic Primer with Grammar, Notes and Glossary.' This text is an important resource that offers insights into the Icelandic language, providing learners with foundational grammar, practical notes, and a glossary to navigate this North Germanic language with greater ease. Sweet's scholarly approach in the primer exemplifies his dedication to precise linguistic description and pedagogy. In addition to his Icelandic work, Sweet made significant contributions to the study of the history and development of English, and his works reflect his broad scholarly interests and his precise approach to language. His influence extended to the formation of the International Phonetic Alphabet (IPA) and he is recognized by many as a pioneer in the field of phonetics. Sweet's scholarly efforts remain a significant part of the linguistic canon and continue to inform the methods of contemporary linguistic study and language teaching.