If the affirmative executory covenants are such as can be enforced by a decree of specific performance, injunction will generally be granted to restrain breach of the negative covenants.1 Thus where performance of a contract concerning the use of railway tracks and a right of way can be enforced specifically breach thereof may be prevented by injunction.2 So a contract to give to vendee the first refusal of vendor's realty may be enforced by injunction if the vendor threatens to sell the realty to another.3 So an injunction may be given against cutting off the supply of natural gas furnished under contract.4 While one who has agreed to buy specific corporate stock may enjoin the vendor from disabling himself from performance by selling so much stock that he will not have enough to deliver under the contract, yet if the corporation will, after issuing the stock contemplated, have enough stock left to perform its contract with the vendee, the latter cannot have an injunction against the contemplated issue.5

Am. St. Rep. 469; 38 L. R. A. 200; 72 N. W. 140; Salomon v. Hertz, 40 N. J. Eq. 400; 2 Atl. 379.

14 Harrison v. Refining Co., 116 Fed. 304; 58 L. R. A. 915.

15 See Sec. 375 et seq,, involving a discussion of most of the cases here cited.

16 See Sec. 1451.

1 Davis v. Davis, 89 Fed. 532.

2 Joy v. St. Louis, 138 U. S. 1.

3 Manchester Ship Canal Co. v. Race Course Co. (1900), 2 Ch. 352.

4 Simpson v. Glass Co., 28 Ind. App. 343; 62 N. E. 753.