If a vector is a 1-column matrix then a corresponding one-form would be a 1-row matrix.
It cannot be said that any one form of collector is superior all round.
He constructed one form of his coherer of a glass tube a few inches long filled with iron borings or brass filings, having contact plates or pins at the end.
It is not quite certain whether a true pepsin exists in plants, but many trypsins have been discovered, and one form of erepsin, at least, is very widespread.
There is probably but little transformation of one form of kinetic energy into another in the plant.
It should be recognized, however, at a halophyte, in fact, is one form of xerophyte (Warming, 09: 219).