A purpresture may be defined as an inclosure by a private party of a part of that which belongs to and ought to be open and free to the enjoyment of the public at large. It is not necessarily a public nuisance. A public nuisance must be some- thing which subjects the public to some degree of inconvenience or annoyance; but a purpresture may exist without putting the public to any inconvenience whatever. At- torney General v. Evart Booming Co., 34 Mich. 462. And see Cobb v. Lincoln Park Com’rs, 202 111. 427, 07 N. E. 5, 63 L. R. A. 264. 95 Am. St. ltep. 258; Columbus v. Jaques. 30 Ga. 506; Sullivan v. Moreno, 19 Fla. 228; U. S. v. Debs (C. C.) 64 Fed. 740; Drake v. Hudson River R. Co., 7 Barb. (N. Y.) 548.