File consists of one letter from Christian Enslin, bookseller and bookbinder, Waterloo, Ontario to Fredrick Heinitsch, M.D., Lancaster, Pennsylvania requesting the right to "Mother Drops", a medicine created by Dr. Heinitsch on which he held the patent.
The letter also includes information on bookbinding and printing practices in Upper Canada and makes reference to local figures such as Benjamin Eby, Bishop of the Mennonites.
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SCA maintains a variety of print and archival collections regarding the history of mathematics, particularly in relation to geometry and computer science. The department holds 45 editions of Euclid’s Elements of Geometry and 110 nineteenth-century mathematic rare books. In addition, the department holds a manuscript by Auguste Bienaime Desire Pioch about calculus, a copy of Lorenzo Mascheroni’s manuscript about geometrical problems, and notebooks containing mathematical problems, solutions, and notes that belonged to Thomas Stowell. Moreover, the department has the papers of some Waterloo faculty members who left their mark in STEMM fields including Donald Cowan, J. Wesley Graham, Ralph Stanton, and undergraduate student [William Kindree](https://archives.uwaterloo.ca/index.php/william-kindree-fonds, who was involved in WATFOR 360.
SCA also maintains collections related to the history of women in STEMM, including the work of zoologist Anne Innis Dagg, public health advocate Catherine Taylor, Elizabeth Smith Shortt, one of the first women in Canada to receive a medical degree, and [Marie Stopes](https://archives.uwaterloo.ca/index.php/marie-stopes-collection-2, who was the first woman appointed to the science staff at the University of Manchester in 1904, known for eugenics and women’s rights advocacy.