Mutual assent must be expressed..................

22

Assent may be expressed by acts....................

22a

Mutual assent is expressed ordinarily by an offer and an acceptance..........

23

Requirements of a promise..................

24

An offer is a promise......................

25

Expression of intention is not an offer..................

26

An offer distinguisghed from preliminary negotiations................

27

Agreements preliminary to written contracts....................

28

Formation of contracts at auction..........................

29

Contracts preliminary to auction sales.........................

30

Tenders.......................

31

General offers..............................

32

Obligations imposed by law without assent distiguished......................

32a

An offer must be communicated; rewards.....................

33

The whole consideration must be given after knowledge of the offer........

33a

An offer by mail must be received..........................

34

Negligent appearance of assent may bind the parties though the actual offer not communicated.....................

35

Offers implied in fact; contracts for services..................

36

Other offers implied in fact............................................

36a

An offer when accepted must be capable of creating a definite obligation......

37

Offers and agreements indefinite as to time........................

38

Offers and agreements of service indefinite as to time.....................

39

Offers and agreements defining incompletely the time of performance.......

40

Offers and agreements indefinite as to price......................

41

Offers and agreements indefinite as to work or property to be given........

42

Offers and agreements where the promisor retains an option................

43

Offers and agreements in which the promisee is given an option............

44

Offers and agreements where something is reserved for future determination

45

Miscellaneous indefinite promises

46

A promise is not too indefinite if it can be made certain by reference to outside matters......................

47

A contract is enforceable though subsidiary promises are too indefinite.......

48

The effect of part performance upon indefinite promises.........................

49