306 
ON DISPLACEMENT. 
has been extensively tried, and has proved more effectual 
than when given alone. 
R 01. Chenopodii (Baltimore) 3iss. 
01. Ricini ^iij. 
01. Anisi gttx. 
Syrupi Rhei et Sennae f|i. 
Mix the three first ingredients, then add the syrup, heat 
the mixture gently, and agitate it well. 
In administering this preparation the vial should oe 
shaken, a teaspoonful given to a child one year old, two tea- 
spoonsful to one or two or three years old, and so in propor- 
tion to age. It should be given at night, and in the morn- 
ing before breakfast. 
ART. LXVII. — ON DISPLACEMENT. 
By John Harris, M. D. 
May not some of the difficulties in the process of dis- 
placement be obviated by a proper use of the stop-cock ? 
These difficulties arise, for the most part, from improper 
comminution of the material to be acted upon, and im- 
proper packing of it in the displacement cylinder. 
If the material, or any large proportion of it, be too finely 
pulverized, the fluid will pass too slowly, or not at all ; 
if too coarsely, it will pass too rapidly ; if unequally, it will 
form channels through which only it will travel, leav- 
ing other portions of the mass untouched. 
The same consequences result from too much, too little, 
or unequal pressure in packing. But, to preserve, in all 
cases, a proper state of comminution, and proper pack- 
ing, calls for the exercise of more care, and of more judg- 
ment, enlightened by experience, than can generally be ex- 
pected. 
Now, let the material to be acted on, be so coarsely 
disintegrated and lightly packed as to permit a svfficient- 
