A legislative ap- propriation of a portion of the public do- main either for charitable or eleemosyn- ary purpose, or for the promotion of the construction of a railroad or other public work. Although the public lands of the United States and of the various states have been to a great extent conveyed by deeds or patents issued in virtue of general laws, many specific grants have also been made, and were the usual method of transfer dur- ing the colonial period. See 3 Wash. R. P. 181; 4 Kent 450. 494; 8 Wheat. 543;6 Pet. 549; 16 id. 367. It is always to be borne in mind in con- struing a congressional grant that the act by which it is made is a law as well as a conveyance, and that such effect must be given to it as will carry out the intent of congress; and this intent should not be de- feated by applying to the grant the com- mon-law rule making grants applicable only to transfers between private parties; 97 U. S. 491. Followed in 10 Am. & Eng. R. Cas. 552. To ascertain that intent courts will look to the condition of the country at the time of making the grants, as well as the purpose of the grants as ex- pressed on their face; 26 Am. & Eng. R. Cas. 513; 113 U. S. 618. All government grants are to be strictly construed against the grantees. Nothing passes but what is conveyed in clear and explicit language, and nothing can be im- plied; 23 How. 66; 23 N. J. Eq. 441. The provisions of various acts of con- gress that the land-grant railroads "shall be and remain a public highway for the use of the government, free from all toll or other charge for transportation of any property or troops of the United States," mean that the government may use the roads, with all fixtures and appurtenances, but not that it may compel the roads to transport property and troops without compensation; 12 Ct. of Cl. 35. Such a railroad is under a perpetual contract made by the Land Grant Act of May 17, 1856, to carry the mails at such rates as con- gress may by law direct or the post-master- general determine; 21 Ct. of Cl. 155. Priority of grant settles the title of the railroad where the claims conflict and not the priority in filing maps of definite loca- tion; 146 U. S. 570; and when grants are made to two railroads, none of the land passes to the second which comes within the prospective rights of the first; id. 615. Title does not vest until the lands are actually selected and set apart under the direction of the secretary of the interior; 141 U. S. 858, 52 Minn. 897. In case of conflict between railroad land grants the elder title must prevail. 80 held, where the Northern Pacific Railroad claimed land in Minnesota under a grant of July 2, 1864, and the St. Paul and Pa- cific Railroad claimed part of the same lands under acts of congress of March 8, 1865, and March 3, 1871; 139 U. S. 1. Where lands are granted by acts of con- gress of the same date, or by the same act, in aid of two railroads that must necessa- rily intersect, each grantee takes an un- divided moiety of the lands within the conflicting limits; 159 id. 349, 372. Where congress grants the odd-number- ed sections of land for a given distance on each side of a railroad, before the road is located, the title does not pass to any par- ticular sections until the line of the road iş made certain, which makes certain also the sections granted: 9 Wall. 95. Where an act of congress makes a grant of land of the odd-numbered sections with- in a certain distance of a railroad, the title of the corporation to the land vests at once, and can only be thereafter divested by the government for a failure to perform con- ditions imposed, or upon a proper pro- ceeding instituted to revest the title in the government; 32 Fed. Rep. 457. The revocation of a land grant to a cor- poration which has become dorinant, and the transfer thereof to another corporation by an act of the state legislature, is not an invasion of private rights and does not, un- less so expressed or clearly implied, burden the transfer with the debts of the dormant corporation; 163 U. S. 31. Where land is granted to a railroad com- pany before its tract is located, the title to the specific land attaches by a location of the road. and takes effect by relation as of the date of the grant, so as to cut off in- tervening claims of other roads, claiming under other grants, unless the lands are spe- cially reserved in the statute; 97 U. S. 491. The grant to the Northern Pacific R. R. of certain public lands is a grant in præ- senti. Yet it is in the nature of a float, and the title does not attach to any speci- fic section until capable of identification; but when once identified, the title attaches as of the date of the grant; 15 U. S. App. 279. A railroad company takes title to the land upon complying with the act and not before; 15 id. 359. " In acts making land grants to railroad companies, conditions are usually imposed which must be complied with to make the grant operative. Among such conditions are frequentl