CALORIC THEORY

Calorie was the scientist who had given Caloric theory which stated that heat was transformed from one place to another in the form of weight minus fluid so he  focused on the material medium and gave way towards convection and conduction if there is no transfer of heat in the material

 medium then caloric is remain constant.This theory was rejected because he did not give the concept of friction in his theory which was the source of heat.Moreover,if heat energy is reached to the earth from the sun then it did not need any material medium to pass through...so he did not give the concept of radiation that's why this theory was rejected later on.