or MICROSCOPIC OBJECTS. 125 



per) a small piece of camphor. This requires no cell, as tht* 

 adhesive power is sufficient. 



DEANE'S COMPOUND. This is usually deemed about the 

 best medium for preserving Alga3, mosses, &c., and is thus 

 prepared : Soak 1 oz. of best gelatine in 4 oz. of water 

 until the gelatine becomes soft, when 5 oz. of honey heated 

 to boiling point are added; boil the mixture, and when it 

 has cooled, but not enough to become stiff, add | oz. recti- 

 fied spirit with which 5 or 6 drops of creosote have been 

 well mixed, and filter the whole through fine flannel. This 

 compound when cold forms a stiff jelly, the use of which 

 will be described elsewhere. 



GLYCERINE JELLY. This mixture closely resembles the 

 above, but as the composition differs a little it may be men- 

 tioned here. It is strongly recommended by Mr. Lawrance 

 in the Microscopic Journal, where he states " that the 

 beautiful green of some mosses mounted two years ago, is still 

 as fresh as on the day they were gathered ;" and that this 

 is the only medium he knows which will preserve the natural 

 colour of vegetable substances. He takes a quantity of 

 Nelson's gelatine, soaks it for two or three hours in cold 

 water, pours off the superfluous water, and heats the soaked 

 gelatine until melted. To each fluid ounce of the gelatine, 

 whilst it is fluid but cool, he adds a fluid drachm of the 

 white of an egg. He then boils this until the albumen 

 coagulates and the gelatine is quite clear, when it is to be 

 filtered through fine flannel, and to each ounce of the clari- 

 fied solution add 6 drachms of a mixture composed one part 

 of glycerine to two parts of camphor-water. 



At the Academy of Natural Sciences of Philadelphia, 

 Mr. W. H. Walmsley stated, that, owing to the heat of that 

 climate, the above formula for glycerine jelly was not satis- 

 factory, and recommended the following : Take one pack- 

 age of Cox's gelatine, wash repeatedly in cold water ; allow 

 it to soak in water sufficient to cover it for an hour or two, 

 add one pint of boiling water, and boil ten or fifteen 

 minutes. Eemove, and when cool but still fluid, add the 



