Volume three covered 18th century pure mathematics, optics and mechanics in 832 pages, while the fourth volume covered 18th century astronomy, mathematical geography and navigation in 688 pages. Vogel writes in:
Dami ng tatlong sakop sa ika-18 siglo purong matematika, optika at mechanics sa 832 na pahina, habang ang ikaapat na dami sakop sa ika-18 siglo astronomy, matematiko heograpiya at navigation sa 688 na pahina. Vogel magsusulat sa: