of nitric acid. Dissolve the mercury in the nitric acid. Di- 

 lute the solution thus obtained with twice its volume of 

 distilled water and decant the clear liquid. 



Sulphuric ether, 2 oz. glass-stoppered bottle. 



Strong alcohol, 2 oz. glass-stoppered bottle. 



Hydrochloric acid, 0.2%. This is made by adding 3.25 

 cc. of the concentrated acid to one-half liter of distilled water. 



Acetic acid, 2 % . Made by adding 6 parts of the commer- 

 cial acetic acid to 100 parts of water. 



Caustic soda, 20%, 100 cc. 



Caustic potash, 20%, 100 cc. 



Caustic potash, 0.1%, 100 cc. 



Sodium carbonate, 1%, 100 cc. 



Barium chloride, saturated solution, 50 cc. 



Copper sulphate, i %, 100 cc. 



Potassium ferrocyanide, 5 %, 100 cc. 



Ammonium sulphate, magnesium sulphate, and sodium 

 chloride in dry form in bottles. Other reagents will be pre- 

 pared as needed. 



II. 



ALBUMINS OR PROTEIDS. 



I. Albumins are soluble in water and dilute saline .solu- 

 tions. They are coagulated by heat. Albumins may be 

 classified as follows : 



(a) Egg-albumin, a non-alkaline solution coagulable with 

 ether ; when injected under the skin or introduced in large 

 quantities into the stomach or rectum, it is given off by the 

 urine. The undiluted albumin is coagulated by 40% formal- 

 dehyde. 



(b) Serum-albumin is obtained from blood-serum. It is 

 not coagulated by ether. When injected under the skin it 

 does not appear in the urine. It is not coagulated by for- 

 maldehyde. 



