PRESERVATIVE MOUNTING MEDIA 519 



/3. Salt solution, O75 per cent, sodium chloride in water. Use- 

 ful as a medium for temporary examination, but not for permanent 

 preservation. 



y. White of an eyy. Simply filter. 



8. Syrup in which is dissolved 1 to 5 per cent, of chloral 

 hydrate, or 1 per cent, of carbolic acid. 



e. Liquid of Ripart and Petit. Camphor water (not saturated). 

 75 grins. ; distilled water, 75 grins. ; glacial acetic acid, 1 grm. ; 

 acetate of copper, O30 grm. ; chloride of copper, O30 grm. Maybe 

 added to preparations stained with methyl-green, which it does not 

 precipitate, and may be used for preserving either vegetal or animal 

 tissues. 



. .Fabre-Domerg tie's Glucose Medium. Glucose syrup of specific 

 gravity 1-1968, 1,000 parts; methyl alcohol (wood spirit), 200; 

 glycerin, 100; camphor to saturation. The glucose to be dissolved 

 in warm water and the other ingredients added, and the mixture, 

 which is always acid, neutralised with a little potash or soda. 



77. Chloral Hydrate. A 5 per cent, solution in water, or 12 grains 

 chloral hydrate to 1 fluid ounce of camphor water. (Mount in strong 

 glycerin jelly.) 



6. Bruris Glucose Medium. Distilled water, 140 parts; cam- 

 phorated spirit, 10 parts; glucose, 40; glycerin, 10. Mix the 

 water, glucose, and glycerin, then add the spirit, and filter to remove 

 the excess of camphor which is precipitated. This medium preserves 

 the colour of preparations stained with anilin dyes, methyl-yreen 

 included. 



i. Gum and Syrup. Gum-mucilage (B.P.) five parts, syrup three 

 parts. Add 5 grains of pure carbolic acid to each ounce of the medium. 



B.P. gum-mucilage is made by putting 4 oz. of picked gum acacia 

 in 6 oz. of distilled water until dissolved. 



Syrup is made by dissolving a pound of loaf sugar in a pint of 

 distilled water and boiling. 



K. The glycerin jelly prepared after the manner of Mr. Lawrence 

 may be strongly recommended as suitable for a great variety of 

 objects, animal as well as vegetable, subject to the cautions alreadv 

 given : ' Take any quantity of Nelson's gelatin, and let it soak for 

 two or three hours in cold water, pour off the superfluous water, and 

 heat the soaked gelatin until melted. To each fluid ounce of the 

 gelatin add one drachm of alcohol and mix well ; then add a fluid 

 drachm of the white of an egg. Mix well while the gelatin is fluid, 

 but cool. Now boil until the albumen coagulates, and the gelatin 

 is quite clear. Filter through fine flannel, and to each fluid ounce of 

 the clarified gelatin add six fluid drachms of Price's pure glycerin, 

 and mix well. For the six fluid drachms of glycerin a mixture of 

 two parts of glycerin to four of camphor-water may be substituted. 

 The objects intended to be mounted in this medium are best prepared 

 by being immersed for some time in a mixture of one part of glycerin 

 with one part of diluted alcohol (one of alcohol to six of water).' T A 

 small quantity of absolute phenol may be added to it with advantage. 



1 A very pure glycerin jelly, of which the Author has made considerable use, is 

 prepared by Mr. Rimmington, chemist, Bradford, Yorkshire. 



