Note 169 — LETTERS ON SCIENCE.

The following is the sentence from Mr. Jukes’ letter alluded to: “Therefore when Mr. Ruskin says that ‘the forms of the Alps are quite visibly owing to the action of elevatory, contractile, and expansive forces,’ I would entreat him to listen to those who have had their vision corrected by the laborious use of chain and theodolite and protractor for many toilsome years over similar forms.”