This practice obtains in all missionary countries, e.g.
By using urea, guanidine, thiourea and related compounds instead of amidines, one obtains the uracils.
A similar condition obtains in the steamengine, in which a great rate of working necessitates the dissipation of a large amount of energy.
In steam cranes much the same principle obtains in proportioning the boiler; e.g.
He obtains a mysterious map to Skull Island, an uncharted location only known in stories.