104 METHODS OP MICROSCOPICAL RESEARCH. 



necessary. This fluid should be allowed to flow 

 under the cover by capillary attraction, and the 

 mount be sealed up in from twenty-four to thirty- 

 six hours afterwards. 



NAPTHA AND CREASOTE. (Dr. Beale's formula.) 



Creasote, 3 drachms. 

 Wood-naptha, 6 ounces. 

 Distilled Water, 64 ounces. 

 Chalk, quant, suff. 



Mix the naptha and creasote together, and add 

 sufficient chalk to produce a thick paste. When this 

 has been mixed smooth, add gradually the water, 

 thoroughly incorporating all the ingredients in a 

 mortar, and let it stand in a lightly covered vessel 

 for two or three weeks. Stir it occasionally. Then 

 pour off the super-natant fluid, which, if necessary, 

 filter. Finally, add some small lumps of camphor, 

 and keep it in a well-stoppered bottle. 



GOADBF'S FLUID. 

 Bay Salt, 4 ounces. 

 Alum (powdered), 2 ounces. 

 Corrosive Sublimate, 4 ounces. 

 Distilled Water, 2 quarts. 



This is an admirable preservative for delicate 

 marine specimens, all entoinostraca and allied 

 organisms ; for larvae and some entomological 

 specimens. 



Mounting Fluid for Algfie (of which it preserves 

 the colour) and for fresh gatherings of diatomacese, 

 desmidiaceae, &c. 



Acetate of Copper, 15 grains. 

 Camphor Water, 4 ounces. 

 Distilled Water, 4 ounces. 

 Acetic Acid (glacial), 20 minims. 



