The contents of the letters published here, again show the great range of subjects that occupied Van Leeuwenhoek: from sugar candy, the shape and crystal structure of diamonds, the dissolution of silver crystals in aqua fortis to gold dust from Guinea dissolved in aqua regia and the dissolution and separation of gold, silver, and copper.

Every volume in the Series contains the texts in the original Dutch and an English translation. The great range of subjects studied by Van Leeuwenhoek is reflected in these letters: instruments to measure water, pulmonary diseases; experiments relating to the solution of gold and silver; salt crystals and grains of sand; botanical work, such as duckweed and germination of orange pips; description on protozoa. blood, spermatozoa and health and hygiene, for example and harmfulness of tea and coffee and the benefits of cleaning teeth.

The Netherlands have a long and important tradition in scholarly philology. For instance in the early days of Leiden University 'philology', or the critical examination of classical texts, was regarded as a 'cutting-edge science'. This field of scholarship had far reaching implications on disciplines such as theology, chronology, astronomy, history, law and other demarcated bodies of knowledge identified as a separate science. Regardless of the exact field of inquiry, philologists as protectors and teachers of the written heritage always played a pivotal role in the formation of the cultural repertoire of the educated public. As men of learning and high esteem, philologists also exerted influence outside the cultural sphere, especially in politics and religion. The ever-changing composition of the philological frame of reference made no difference in this respect. But in the nineteenth century, the practice of philology was passing a crucial phase of change. In both its object of study and in its methods, several fundamental modifications occurred. Texts in the vernacular and national philologies attracted more and more attention of the public, and 'neo-philology' succeeded in taking over the central position traditionally occupied by classical philology. Subfields such as 'linguistics', 'edition technique' and 'history' grew into new, more-or-less independent (sub-)disciplines, whereas scientific methods such as stemmatology and comparative approaches were introduced in the humanities. This redesigned the landscape of philology radically. New boundaries became apparent and existing ones were questioned or drawn sharper. At the time, philology underwent an accelerated process of differentiation and professionalization. Philology demarcated its own more or less independent sphere, with a specific authority. The establishment of a branch of 'national philology' can be regarded as an example of discipline formation in the humanities. This fascinating process of change and the search for new boundaries in Dutch philology is highlighted in this book The Practice of Philology in the Netherlands in the Nineteenth Century, the first book on this topic in the English language.

This volume, Volume 1, presents Marggrafe's stunning biography. Volume 2 consists of a text edition of his astronomical legacy, prepared for the printing press in the 1650s, but only now finalized and published. Georg Marggrafe (1610-1643) is today hailed as the principal author of an influential account of the natural history of Northern Brazil and as compiler of the first accurate map of the area, which is considered as one of the most elegant products of seventeenth-century Dutch cartography. But initial he had the ambition to become known in astronomy. With the support Johan Maurits van Nassau-Siegen, then governor-general of colonial Dutch Brazil, he built in Recife the first European-style astronomical observatory on the South-American continent, where he systematically charted the southern stars. He intended to supplement the famous astronomer Tycho Brahe, who charted the Northern sky half a century before. But Marggrafe's untimely death (and the negligence of a Leiden professor) prevented the publication of his valuable observations. As a result, Marggrafe did not achieve fame in astronomy, but instead became famous for his equally remarkable other achievements.