ADHESIVE PLASTER EXEMPT FROM LEAD. 97 
syrup with 16 fluid ounces of water, merely carrying the 
heat to ebullition in a covered vessel, straining and bottling 
hot. Prepared in this way, syrup of orange peel has a fine 
amber colour, and the orange taste in a marked degree. 
ART. XXX.— ADHESIVE PLASTER EXEMPT FROM LEAD. 
By M. Pettenkofer. 
With the design of obviating the accidents that are occa- 
sioned under some circumstances by the absorption of soap 
of lead, and the 1 irritant properties of the oleo-resins; in a 
word, to prevent the inconveniences arising from the em- 
ployment of adhesive diachylon in medical practice, M. 
Pettenkofer proposes the therapeutical employment of the 
following preparation : mix eight parts of soap of lime, 
four of resin of turpentine, and one of suet; boil the mix- 
ture with a sufficiency of water until the whole enters into 
a homogeneous fusion, and then malaxate it in water as 
usual. If any undissolved particles of lime soap remain, 
it should be strained through linen. Lime soap does not 
melt in boiling water when alone, but with the resin its 
fusion is easy and complete. 
As to the lime soap, it can readily be made either by 
saponifying olive oil with hydrate of lime, or, better, by add- 
ing a solution of a soluble salt of lime to an aqueous solu- 
tion of olive oil soap. In the first case, an ounce and a 
quarter of recently burnt lime is slaked with six ounces of 
water, and reduced to a homogeneous consistence, then 
heat six ounces of olive oil in a tinned copper basin to some 
degrees above the boiling point of water, and add the milk 
of lime to the hot oil and maintain the mixture at the tem- 
9* 
