It is generally believed that the influence of light on respiration is indirect even though physiologists like Emerson and Lewis (1943) have reported that Illuminated Chlorella cells have a higher rate of respiration than those kept in darkness. A similar effect on barley seedlings has been observed by Johnson (1944). But there is no stoppage of respiration indirectly by gov­erning the supply of respirable materials via photosynthesis. Another influ­ence of ligh is that by increasing temperature, it increases the rate of res­piration.