Parsons' rule has been approved in many cases. ( Gray v. Hinton, 2 McCrary, 167; Shinn v. Bodine, 60 Pa. St. 182; Mining Co. v. Jones, 108 Pa. St. 55, 66; More v. Bonnet, 40 Cal. 251; Clark v. Baker, 5 Metc. (Mass.) 452; Morse v. Brackett, 98 Mass. 205; Mansfield v. Trigg, 113 Mass. 350.) Viewing this contract as a whole, and taking into consideration all of the language used in it, it seems clear that the intention was to make it entire as to all of the land embraced therein, and not divisible into four different contracts for as many different tracts.