In many of the states there are statutory provisions authorizing an owner of land to have it surveyed and laid off in lots and blocks, streets, parks, and the like, and to file in the public records a plate or map of the land as thus laid off, authenticated and certified as may be required. Thereafter any one of these lots or blocks may be conveyed by mere reference to the number which it bears upon the recorded plat, thus all necessity of a detailed description being obviated. The statute usually contains provisions to the effect that the filing of the plat shall constitute a dedication of the land marked thereon as intended for streets or other public uses.

Even though there is no statutory provision on the subject, or the plat is not authenticated and recorded as required by the statute, a reference in the conveyance to a particular plat for the purposes of description makes the plat in effect a part of the conveyance, and it may accordingly be utilized to identify the land conveyed.58 The only effect, therefore, of the statutes providing for the record of plats, so far as concerns their use for purposes of description, is apparently to furnish a means for their preservation, and thus to avoid any possible loss of the means of identifying the land.