To begin with I would like to say a few words about the title of this paper. It is exactly as given to me by the Grassland Association, "Evaluation of Economic Aspects of Aerial Top-Dressing". It is not uncommon for the deliverer of a paper to be given a subject and then to select his own angle of that subject and title it accordingly. In fact, that is the more usual procedure, and of course could quite easily have been adopted by me in this instance.
