The MicRoscolPK. 13 



Salt, and filter. This gives a very dense liquid of high refractive 

 index (3.02). For Diatoms, etc.; may be used diluted. 



MoNOBROMiDE OP' NAPHTHALiN. High rcfractive index ; fot 

 Diatoms, etc. 



MoNOBROMiDE BALSAMS solutiou of hardened Canada balsam 

 in monobromide of naphthalin. Refractive index high, l.G\ 

 shows finer structure of Diatoms, etc. 



Monobromide tolu. Weir's medium: solution of balsam 

 tolu in monobromide of naphthalin. Refractive index 1.73 ) 

 may prove very valuable as a medium for Diatoms. Preparation'. 

 Dissolve 3 ounces of balsam tolu in 4 fluid drams of benzol^ 

 add 4 fluid ounces carbon disulpide, shake well ; let separate 

 into layers; pour off carbon disulphide; renew this treatment 

 with more carbon disulphide; pour it off again; evaporate the 

 benzol from the balsam tolu. The tolu will now be free from 

 cinnamic acid ; put 1 fluid dram of monobromide of naphtha^ 

 lin in ^ ounce vial, add enough of the purified tolu to make a 

 stiff" mixture or solution when cold. Heat to 104^ or 122° Fv 

 when using. 



Pacini's solution: sodium chloride, 1 part; corrosive subli' 

 mate, 2 parts; water 113 parts; glycerine, 13 parts. Let it 

 stand 3 months, then use 1 part with 3 of water; filter before 

 using. Recommended as a preservative of delicate tissues. 



Phosphorus (Stephenson): concentrated solution in carbon 

 disulphide. High refractive index ; difficult and dangerous to 

 use ; takes fire spontaneously in the air. 



Ripart's solution: camphor water, 75 parts; distilled water, 

 75 parts ; glacial acetic acid, 1 part ; copper acetate, 0.3 parts ; 

 copper chloride, 0.3 parts. Useful for delicate vegetable tissues, 

 Desmids, Confervse, etc. 



Styrax: chloroform solution For Diatoms; high refractive 

 index. 



American styrax: chloroform solution filtered and hardened. 

 Color as light as that of good balsam ; high refractive index ; for 

 Diatoms and fine tissues. 



Harting's corrosive sublimate solution : corrosive sublimate, 

 1 part; water 200 to 500 parts. For blood corpuscles, etc. 



'\Villiam's solution: saltpetre, 2 ounces; sal ammoniac, 2 

 drams; corrosive sublimate, 1 dram; glycerine, 2 ounces; alco- 

 hol,, 1 pint ; Avater 2 quarts. Let stand for several days ; filter. 



