72 APPLIED PHYSIOLOGY 



be killed quickly and painlessly by placing it in a tight box or covered 

 paH and pouring in half an ounce of chloroform. Demonstrations of 

 the internal organs had better be made only before those members 

 of classes who wish to see them. 



36. It is well to preserve permanent specimens of the different 

 organs. One part of formalin to 30 parts of water is most excellent. 

 It is neither expensive nor poisonous, while it preserves specimens in 

 their natural form and color. The following inexpensive mixture, 

 known as Mullens fluid, is also good. 



Sodium sulphate (Glauber's salt), i part, 

 Potassium bichromate, 2 parts, 



Water, 100 parts. 



This forms a yellow fluid and stains the specimens yellow. It is 

 only slightly poisonous, even if taken into the mouth, while soap and 

 water will remove it from the hands. 



Put the specimen in a large covered earthen or glass jar, with an 

 amount of the fluid equal to at least five times the bulk of the speci- 

 men. Remove it from the jar to a platter when showing it to the 

 class. The fluid will harden the tissues so that even soft organs may 

 be handled with safety. 



Special training is required in preparing microscopic specimens 

 showing the tissues in their proper position. The difficulty consists in 

 cutting a slice thin enough ; for the microscope magnifies in thickness 

 as well as in length and breadth. 



37. Open the abdomen of a dead animal by a cut from the ribs to 

 the end of the body. Notice that the organs and walls of the abdomen 

 are shiny from their covering of peritoneum. Notice that the perito- 

 neum is thin and strong, that its appearance differs from that of a 

 mucous membrane, and that it can be peeled from the abdominal 

 walls. (See demonstration 35.) 



38. Notice the shape and position of the stomach. Open it to show 

 the folds in the mucous membrane. With a specimen of mucous mem- 

 brane under the microscope show the short, straight gastric glands stand- 

 ing side by side. Sketch them. (See demonstration 35.) 



39. Notice the dome of muscle extending completely across the body 

 above the stomach. Explain that this is the diaphragm, and that it 

 divides the body into two cavities. Open the chest and show its cavity 

 and the top of the diaphragm, which separates it from the abdominal 

 cavity. (See demonstration 35.) 



