In his influential 1779 book "Experiments and Observations on Animal Heat", Crawford presented new experiments proving that respiratory gas exchange in animals is a combustion (two years after Antoine Lavoisier's influential "On combustion in general").
I sin indflydelsesrige bog fra 1779, Experiments and Observations on Animal Heat, præsenterede Crawford nye eksperimenter, der beviste, at gasser ved åndedrætsudveksling i dyr er en forbrænding (to år efter Antoine Lavoisiers indflydelsesrige bog On combustion in general).