36 



STUDENTS HISTOLOGY 



DAMMAR is sometimes used in the same manner as balsam. 

 Balsam and dammar may be kept in large-mouthed bottles, from 

 which they are removed with glass rods. They are also sold in 

 flexible lead tubes, which make a convenient way of handling 

 them. 



Fresh tissues are often studied in a six -tenths Of one per 

 cent, solution of sodium chloride in water NORMAL SALT SOLUTION. 



FIG. 15. USING TURN-TABLE AFTER FREEBORN. 



Objects are often mounted in GLYCERIN, especially those that 

 would be injured by alcohol. It is best to use a circular cover- 

 glass, and to surround the edge with some soluble cement, using a 

 turn-table for this purpose. 



Zinc cement, asphalt varnish, and other suitable cements may 

 be purchased from dealers in microscopical supplies. 



STAINING METHODS 

 H^MATOXYLIN STAINING PROCESS 



You will require for future work a needle like Fig. 16, several 

 saucers, preferably of white ware; a few watch-glasses (large, odd 

 sizes are usually cheaply obtainable at a jeweler's) ; half a dozen 



FIG. 16. NEEDLE FOR LIFTING SECTIONS, ETC. 



glass saltcellars small ones known as "individual salts," and 

 a two -ounce, shallow, covered porcelain box, such as druggists 

 use for ointments, dentifrices, etc. 



Place on the work-table (best located so as to be lighted from 

 your side and not from the front) in order, as in Fig. 17: 



