126 PREPARATION AND MOUNTING 
white of an egg, well beaten, and again boil, until the albu- 
men coagulates. Strain whilst hot through flannel, and 
add an equal portion by measurement of Bowyer’s pure 
glycerine, and fifty drops of carbolic acid in solution; boil 
again for ten or fifteen minutes, and again strain through 
flannel, place in a water-bath and evaporate to about one- 
half, then filter into two or more broad-mouthed vials. (Cotton 
is the best filtering medium.) The use of this in mounting 
is the same as Mr. Lawrance’s, elsewhere described. 
GoapBy’s Fiuip.—This is much used in the preservation 
of animal objects; and seldom, if ever, acts upon the colours. 
It is thus prepared :—Bay salt, 4 oz.; alum, 2 oz.; corrosive 
sublimate, 4 grains. Dissolve these in two quarts of boiling 
water, and filter. For delicate preparations some recom- 
mend that this mixture be reduced by the addition of an 
equal quantity of water; but where there is bone or shell in 
the object, the above acts injuriously upon it, in which case 
this fluid may be used:—Bay salt, 8 oz.; corrosive subli- 
mate, 2 grains; water, 1 quart. 
Tuwaites’s Liquiv.—This is recommended for the preser- 
vation of Alge, &c., as having little or no action on the 
colour, and is thus prepared:—Take one part of rectified 
spirit, add drops of creosote enough to saturate it; to this 
add sixteen parts of distilled water and a little prepared 
chalk, and filter. When filtered, mix with an equal quantity 
of camphor-water (as before mentioned), and strain through 
fine muslin before using. 
CHLORIDE or Zinc Sotvution.—In the Micrographic Dic- 
tionary this is stated to be “ perhaps the best preservative 
known for animal tissues.” Persons of great experience, 
however, have given a very different opinion; but it is cer- 
tainly very useful in many cases where a small degree of 
coagulating action is not injurious. It is used of strengths 
varying according to the softness of the parts to be pre- 
served; the average being 20 grains of the fused chloride to 
1 oz. of distilled water. To keep this liquid, a lump of cam- 
phor may be left floating in the bottle. I have heard com- 
