Show the science of sleep it Is a curious tact but one by no means astonishing that until of late days a satisfactory explanation ot leep and its causation was hardly to be met a ith within the bounds of phys science anaemia of the brain was regarded as the origin ot our slumbers but it became clear that this bloodlessness was to be regarded ragar ded rather as a result of some other and more primary process than as itself a true or direct cause of sleep the theory has been revived that sleep la due to the liberation into the blood of certain substances which are manufactured by certain glands these are not defined by the way with the result that our brain cells are sent dozing alongside I 1 this view may be placed that other which supposed that a greater amount of carbonic add gas being produced as the result of bodily work or want of ot this product being rep resented we went to sleep because our brain cells were thus numbed by the gas |