It is not that Lamb would have found it an easy task to compose a long paper in Latin-nobody can, find it easy to do what he has no motive for habitually practising; but a single sentence of Latin wearing the secret countersign of the "sweet Roman hand," ascertains sufficiently that, in reading Latin classics, a man feels and comprehends their peculiar force or beauty.
"Biographical Essays"
Thomas de Quincey
Another thing that the experienced practitioner ascertains is what previous treatment, if any, the animal has had.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Sanitary Science ascertains the causes of disease.
"Political economy"
W. Stanley Jevons