Determination of Cell Function in an Insect

I Propose to consider two kinds of determination and differentiation which have been studied in the hemipteron Rhodnius prolixus. (i) The determination of the cell or group of cells, with their subsequent differentiation to produce a given part of the body, (ii) The determination or control of the characters of that part—whether these are to be juvenile (larval) or adult (imaginal). Discussion of this second type of determination will require consideration of the role of hormones in controlling differentiation in insects.