1. “The phenomena of pumps and siphons are explained by the weight of air.”
The theses were outlines prepared earlier by tutors or sophisters, generally of single-page
length, listing points relevant to the question posed and thus providing material
for class discussion. Collections of theses on various questions might be kept by
a tutor for the use of succeeding classes or passed down by students. The question
might be one which had been disputed at an earlier commencement or be disputed at
a future one; for an example see entry of 26 June, below, and note there.