On the southern boundary it is not desirable to reduce the already moderate width of the carriage way. It is, on the other hand, a question whether, as the streets and the park both, in reality, are the property of one owner—the City—this street should not be treated in a similar manner. It will, from its position, be in time rather crowded with traffic, and will, therefore, have some claim to be widened on this ground alone. As a question of beauty of arrangement for the park itself, however, it is conceived that if by this management a more stately character than could otherwise be obtained would be secured to the outer boundaries of the park, it would be cheaply purchased at the sacrifice of a few feet at the south end, off its present length of two and a half miles. In riding along any of the avenues, the eye cannot fail to be struck with the great difference in dignity of effect, between such streets as Fourteenth and Twenty-Third, and those intermediate, and it would be a matter of regret that a source of effect so easily obtained, should be lost in connection with the grand approaches to the park, because it does not happen that its boundaries at present coincide with the wide streets laid out on the working plan upon which the city is being constructed. If, moreover, the advantage of the evening promenade is allowed to be of importance, we should be sorry to dispense with this section of it, which would be the only portion having a direct communication from the Sixth and Seventh avenues. [Sidenote: Treatment of boundary lines.] For the purpose of concealing the houses on the opposite side of the street, from the park, and to insure an umbrageous horizon line, it is proposed, as will be seen in the plan, to plant a line of trees all around the outer edge of the park, between the sidewalk and the roadway.[3] On approaching the Fifth and Eighth avenue entrances, this line of trees along Fifty-Ninth street will come prominently into view, and have a handsome effect, if the street is widened; but if Fifty-Ninth street is allowed to remain as a narrow street, it is feared that it will be difficult to prevent this boundary line of the park from having a contracted and somewhat mean appearance. Hence, we have thought it proper in our plan to assume the advantage and practicability of this arrangement to be conceded; but, if this should not be the case, it will be readily perceived that it forms no essential part of our design.[4] [3] NOTE, 1868.—This feature of the design has been partially carried into execution and is in progress from year to year, as the street and avenue grades become settled. [4] NOTE, 1868.—In execution, 59th street has been treated as here recommended.