Note two large conspicuous soft brown lobes of tissue. These form the _liver_, an organ which produces a secretion that assists in the process of digestion. Note just anterior to the liver and extending between its two lobes a pear-shaped organ, the _heart_, which may yet be pulsating. Are these pulsations regular? How many occur in a minute? The lower end or apex of the heart, _ventricle_, undergoes a contraction, forcing blood out into the _blood-vessels_. This is followed by a relaxation of the apex and a contraction of the basal portion, the _auricle_. The heart is surrounded by a delicate semi-transparent sac, the _pericardium_. The pericardium is filled with a watery fluid, _body-lymph_, which bathes the heart. Note between the lobes of the liver a small bladder-shaped transparent organ of a pinkish color. This is the _gall-cyst_, or _gall-bladder_, a reservoir for the _bile_, the secretion from the liver. Separate the lobes of the liver and note, beneath, the long convoluted tube which fills most of the body-cavity. This is part of the _alimentary canal_. Is the alimentary canal of uniform character? The most anterior portion of the canal, the _gullet_ or _œsophagus_, leads to a large U-shaped enlargement, the _stomach_. From the lower end of the stomach there extends a long, slender, very much convoluted tube, the _small intestine_, which is followed by a much larger one, the _large intestine_. This large intestine after one or two turns passes directly back into the _rectum_, which opens at last to the exterior through the anus. Note just ventral to the rectum a large thin-walled membranous sac. This is the _urinary bladder_ which acts as a reservoir for the secretion from the _kidneys_. Notice a many-branched yellow structure with a glistening appearance, the _fat-body_ (_corpus adiposum_). Now push liver and intestine to one side and note the pinkish sac-like bodies (perhaps filled with air), the _lungs_. The lungs are paired bodies which open into the laryngo-tracheal chamber. The toad takes air into its mouth through its nostrils, and then forces it, by a kind of swallowing action, through the laryngo-tracheal chamber into the lungs. Now lift the stomach and note in the loop between its lower end and the small intestine a thin transparent tissue. This is a part of the _mesentery_, which will be found to suspend the whole alimentary canal and its attached organs to the dorsal wall of the body. Note in the loop of the stomach in the mesentery an irregular pinkish glandular structure which leads by a small duct into the intestine. This gland is the _pancreas_, and the duct is the _pancreatic duct_. From it comes a secretion which aids in the digestion of food. Near the upper end of the pancreas note a round nodular structure, generally dark red. This is the _spleen_, a ductless gland, the use of which is not altogether known. Make a drawing which will show as many of the organs noted as possible.