MOUNTING MEDIA. 6/ 



fluid which has escaped beyond its edge is neatly 

 removed with bits of bibulous paper, and a mod- 

 erately-heavy ring of benzole-balsam is painted 

 round the cover. When this is dry a coating of 

 asphalt may be added to toughen the cell if de- 

 sired. With a little practice one learns to esti- 

 mate the quantity of fluid needed in a given case, 

 so that very little is forced out, and, the slide being 

 perfectly dry and clean, except at the one point 

 of escape, the cell which is built up adheres 

 well W. T.] 



GLYCERINE JELLY. NordstedtV directions for 

 the preparation of this substance (for mounting 

 algae) are as follows : One part of pure gelatine is 

 dissolved in three parts of hot distilled water and 

 four parts of glycerine. To prevent moulding, a 

 small piece of camphor or a drop of carbolic acid 

 is added. The mass hardens on cooling, and must 

 be slightly warmed when needed for use. 



Kaiser 2 gives the following recipe : One part by 

 weight of the. best French gelatine [Cox's gelatine 

 is equally good] is soaked in six parts of distilled 

 water for two hours, seven parts of chemically 

 pure glycerine are added, and I gm. of carbolic 

 acid is added to 100 gms. of the mixture. The 

 whole is then heated ten to fifteen minutes, mean- 



1 Om anvandandet af gelatinglycerin vid undersokning og preparering 

 af Desmidieer. Botaniska Notiser, 1876, No. 2. 



* Botanisches Centralblatt, 1880, No. i, p. i^. Cf. also Glycerin- 

 Gelatine for Mounting. Journ.of Royal Micr. Soc., 1880, Vol. III., p. 502. 



