§30 | ORD. XXVIII. Pomacee. CITRUS MEDICA, 
sharpness, As to reducing it to the state of a rob, we have 
already noticed the objections of Dr. Cullen in treating of the 
orange juice. 
To preserve Lemon juice in purity for a considerable length of 
time, it is necessary that it should be brought to a highly con- 
centrated state, and for this purpose it has been recommended to 
expose the juice to a degree of cold sufficient to congeal the 
aqueous and mucilaginous parts. After a crust of ice is formed, 
the juice is poured into another vessel; and by repeating this 
process several times, the remaining juice, we are informed, has 
been concentrated to eight times its original strength, and kept 
without suffering any material change for several years.’ The 
ice first formed is wholly void of acidity, but the subsequent 
congelations become more and more imbued with the acid. 
Whytt found the juice of Lemons to allay hysterical palpitations 
of the heart, after various other medicines had been experienced 
ineffectual ;* and this juice, or that of oranges, taken to the 
quantity of four or six ounces a-day, has sometimes been found 
a remedy in the jaundice." 
The exterior rind of Lemons is a grateful aromatic bitter, but 
less hot than orange-peel, and yields in distillation a less quantity 
of oil: the oil is extremely light, almost colourless, in smell nearly 
as agreeable as the fresh peel, and frequently employed as a per- 
‘fume: it is generally brought to us from the southern parts of 
Europe, under the name of Essence of Lemons, The Lemon peel, 
* See Georgii, 1. c. 
- Lemon juice also may be evaporated by the heat of the sun, till it forms a solid 
salt, in which state it was brought from Jamaica, and found extremely grateful to 
the taste, and in such a concentrated state, that one scruple of it dissolved in a 
quantity of water equal to the juice contained in a lemon, was rendered of the 
degxee of acidity. See Percival Phi/. Med. & Experimental Essays, p. 219. 
8 On Nervous Disorders. See his Works, p. 649. 
» Vide Saunders Elements of the Practice of Physic, p. 170. 
ee 
