"In the same connection he characterizes nitrogen as a substance 'not condensible under fifty atmospheres,' leaving the reader to infer that the preceding ingredient on the list, oxygen, is condensible (liquefiable) within that limit of pressure, and that nitrogen becomes liquid at or above it; whereas neither oxygen nor nitrogen has ever yet been compressed into a liquid, although a force of more than fifty times

"In the same connection he characterizes nitrogen as a substance 'not condensible under fifty atmospheres,' leaving the reader to infer that the preceding ingredient on the list, oxygen, is condensible (liquefiable) within that limit of pressure, and that nitrogen becomes liquid at or above it; whereas neither oxygen nor nitrogen has ever yet been compressed into a liquid, although a force of more than fifty times