29. Agreements, the meaning of which is not certain, or capable of being made certain, are void.Illustrations (a) A agrees to sell to B "a hundred tons of oil". There is nothing whatever to show what kind of oil was intended. The agreement is void for uncertainty. (b) A agrees to sell to B one hundred tons of oil of a specified description, known as an article of commerce. There is no uncertainty here to make the agreement void. (c) A, who is a dealer in coconut-oil only, agrees to sell to B "one hundred tons of oil". The nature of A's trade affords an indication of the meaning of the words, and A has entered into a contract for the sale of one hundred tons of Coconut-oil. (d) A agrees to sell B "all the grain in my granary at ²[Rangpur]". There is no uncertainty here to make the agreement void. (e) A agrees to sell to B "one thousand mounds of rice at a price to be fixed by C". As the price is capable of being made certain, there is no uncertainty here to make the agreement void. (f) A agrees to sell to B "my white horse for Taka five hundred or Taka one thousand". There is nothing to show which of the two prices was to be given. The agreement is void.