Students attend lectures and seminars and take part in practical pharmacy placements.

Thus in the fall of 1849, Parrish established a school of practical pharmacy at his shop whose curriculum was addressed especially to medical students.

Materia Medica was integrated into the fourth year, where practical pharmacy was taught.

He was appointed professor of materia medica in 1864, and in 1867 exchanged his chair with John Michael Maisch, taking that of practical pharmacy, on which branch he continued to lecture until his death.