THe Microscope. 53 
It is prepared as follows: 
iBesteearmines- 2s o2 = ees 2idrachms: 
Distiilediwater 2324-= =. ee ne se 3 ounces. 
Strong liquor ammonig-_.-- ~-..---... =... -- 20 drops. 
Dissolve this and filter through cotton, covering the funnel 
with a piece of glass plate, to prevent the evaporation of the 
ammonia. 
Cox segelating =< <5 22. 2 Se 2 drachms. 
Wistillediwater {22-2 o- S k 2 ounces. 
Soak the gelatine in the water until it becomes soft, and 
then dissolve it in a water bath and strain through fine flannel 
while hot. Heat the gelatine solution again and add the ear- 
mine solution. Bring the temperature up to 100° F. and add 
dilute acetic acid, drop by drop, under constant stirring, until 
the ammonia is neutralized, or until the solution changes from 
a lilac to a scarlet color. 
CARTER’S MASS. 
| ETT a Se a ee ee eee 60 grains. 
Sirol? aMMNIGN IA 9H. ota eS 120 minims. 
Glacislycemeiaerd)-— 3200225222422 eee 86 minims. 
Glye 1 part 
Water 6 parts \ 2.02. 
IWidtel oan taen oe ae ee ke ee 1} ounces. 
Solution of gelatine-----_-- dane eee i SS 
Dissolve the carmine in the ammonia and water with the 
aid of gentle heat, and filter; add to this 13 ounces of hot gelatine 
solution, and mix thoroughly. Add the acid to the remaining 4 
ounee of gelatine solution, and drop this into the heated car- 
mine mixture, with constant stirring. 
There are several modifications of Carter’s formula, all 
seeking a better way of neutralizing the ammonia. 
BLUE MASS. 
SolubleiPrussian’ bine—2<=- >. 5 === ee 4 drachms. 
Gelstine eee ae ee eo eee 4 ounces. 
Distiilediuwater-soe= soo ee ee 20 ounces. 
Treat the gelatine the same as in making the carmine mass, 
using half the water; then add the Prussian blue dissolved 
in the other half of the water, keeping both solutions hot, and 
constantly stirring while cooling is going on. 
