242 PRACTICAL HISTOLOGY. 



(p. 193), and need not here be more particularly de- 

 scribed. 

 Preparation 17. The mammary glands, 



Small pieces of these organs are hardened by being 

 placed in ^ per cent, chromic acid solution for a 

 week or ten days, subsequently transferring them 

 to spirit. The mixture of equal parts of spirit and 

 J per cent, chromic acid may also be used and pro- 

 duces the desired result more rapidly (in two or 

 three days); moreover the sections stain more readily 

 with logwood. They may be mounted either in 

 dammar or in glycerine. The appearances presented 

 by the cells of the alveoli vary considerably accord- 

 ing to the state of functional activity of the gland. 

 (See Creighton, Report of the Medical Officer to the 

 Privy Council, 1875, and Journal of Anatomy and 

 Physiology, October, 1876.) 



