（That a discrete proportionA
‘discrete proportion’ means one in which the two ratios are
disconnected, being between different terms, whereas in a ‘continuous
proportion’ they have one term in common. has four terms is plain, but
so also has a continuous proportion, since it treats one term as two, and repeats it:
for
example,Here the lecturer displayed a
diagram. as the line representing term one is to the line representing term two, so
is the line representing term two to the line representing term three; here the line
representing term two is mentioned twice, so that if it be counted twice, there will be
four proportionals.）