Descriptions of it are found in guide-books and works upon art.
Does it follow that works upon that science should not be read?
The works upon, and descriptions of, the astrolabe, are numerous.
Their wide circulation is an indication of the demand for works upon this subject.
The things that he works upon must be valuable to him personally.
Further, Fléron was the strongest of the works upon this side of the river.
For the works upon the Roman constitution see below, at the end of this and at the beginning of the third period.
He was not, however, equally inclined to grand proportions, and works upon an extensive scale.
There is iron in this machinery; but it works upon brass or copper wheels, so that friction generates heat, but not fire.
His works upon his favorite study are authority with students of science all over the world.