[298] Opt. Book II. par. 3. prop. 4.
[299] Opt. Book II. pag. 241.
[300] Ibid. pag. 224.
[301] Ibid. Obs. 17. &c.
[302] Ibid. Obs. 10.
[303] Ibid. pag. 206.
[304] Obser. 21.
[305] Observ. 5. compared with Observ. 10
[306] Ibid. prop. 5.
[307] Observ. 7.