MACERATION, DIGESTION, AND CORROSION. 277 



kept for some hours in the liquid at a temperature of 100 F. 

 (37 C.) 



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



Glycerinated extract of pig's stomach . 1 vol. 



0'2 per cent, solution of HC1 . . .3 vols. 



Thymol, a few crystals. 



BICKFALVI'H (Centrall. med. Wiss., 1883, p. 838). One 

 Lj-rin. 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. milt. 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 Nuchae) 

 remain in it at the ordinary temperature for ten to forty 

 minutes. 



549. Pancreatin. SCHIEFFERDECKER'S (Zeit. uiss. 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. Phys. Inst. Univ. Heidelberg, i, 2, 1877, p. 219). 

 Very complicated. 



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

 MA As, Festschr. Kupffer, 1899, p. 211, and HoEHL,.^rc7i. Anat. Phys., 

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

 puncreatin, with 0'3 per cent, of carbonate of soda ; for demonstrating 

 adenoid tissue in paraffin sections). 



Corrosion. 



550. 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(J.?I^. 

 Anz., xiv, 1898, p. 418) ; DENKER (Anat. Hefte., 1900, p 300) ; 

 TUOMA and FROMHERZ (Arch. Entu-ickeltingsmech, vii, 1898. 



