CHAPTER XXIIL 249 



To prepare the digestion fluid, the powder is dissolved in distilled 

 water, and the solution filtered. Or the powder may be dissolved 

 in glycerin. The tissues to be digested may be kept for some 

 hours in the liquid at a temperature of 100 F. (37 C.). 



BRUCKE'S (from CARNOY'S Biologie cellulaire, p. 94). 



Glycerinated extract of pig's stomach . 1 volume. 

 0-2 per cent, solution of HC1 . . 3 volumes. 

 Thymol, a few crystals. 



BICKFALVI'S (Centrabl. med. Wiss., 1883, p. 838). One grm. 

 of dried stomachal mucosa is mixed with 20 c.c. of 0-5 per cent, 

 hydrochloric acid, and put into an incubator for three or four hours, 

 then filtered. Macerate for not more than half an hour to an hour. 



KUSKOW'S (Arch. mik. Anat., xxx, p. 32). One part of pepsin 

 dissolved in 200 parts of 3 per cent, solution of oxalic acid. The 

 solution should be freshly prepared, and the objects (sections of 

 hardened Ligamentum Nuchse) remain in it at the ordinary tem- 

 perature for ten to forty minutes. 



541. Pancreatin. SCHIEFFERDECKER'S (Zeit. wiss. Mik., iii, 

 1886, p. 483). A saturated solution of the " Pankreatinum siccum," 

 prepared by Dr. Witte, Rostock, is made in distilled water, cold, 

 and filtered. Pieces of tissue (epidermis) are macerated in it for 

 three to four hours at about body temperature. 



KUHNE'S (Unters. a. d. PJiys. Inst. Univ. Heidelberg, i, 2, 1877, p. 219). 

 Very complicated. 



See also GEDOELST, La Cellule, iii, 1887, p. 117, and v, 1889, p. 126 ; 

 MAAS, Festsclir. Kupffer, 1899, p. 211, and HOEHL, Arch. Anat. Phys., 

 Anat. Abth., 1897, p. 136 (A to f per cent, solution of Mall's or Merck's 

 pancreatin, with 0-3 per cent, of carbonate of soda ; for demonstrating 

 adenoid tissue in paraffin sections). 



Corrosion. 



542. Corrosion is the operation of destroying the soft parts that 

 surround hard parts that it is desired to study in short, a means 

 of cleansing hard parts for microscopic study. It has been applied 

 to the removal of surrounding tissue from injected vessels or cavities. 

 For this, see ALTMANN'S Method (Arch. mik. Anat., 1879, p. 471, or 

 previous editions) ; also REJSEK (Bibliogr. Anat., iv, 1897, p. 229) ; 

 BRUHL (Anat. Anz., xiv, 1898, p. 418) ; DENKER (Anat. Hefte., 1900, 

 p. 300) ; THOMA and FROMHERZ (Arch. Entwickelungsmech, vii, 

 1898, p. 678) ; PEABODY (Z. Bull., Boston, 1897, p. 164). The 

 following sections relate chiefly to the cleansing of native hard 

 parts. 



