TilE CODEX AND THE BillTISII PilAllM ACOPtE IA. 
7.21 
micro-chemist and microscopist, on account of the simplicity and delicacy of the 
process, and the beauty of the results which it yields, directly in the sublimates 
themselves, and remotely in the effect of reagents upon them. The few spe¬ 
cimens of the sublimates of strychnia, morphia, solanine, and cryptopia, and 
of their reactions, which were shown at the late soires of the Pharmaceutical 
Society will, I think, justify this expectation. 
I hope to be able to resume this subject on an early occasion, and to indicate 
more precisely the advantages which we may e.xpect to derive from the use of 
this method. 
THE COHEX AND THE PPITISH PHAEMACOPHllA. 
i!Y A. F. IIASELDEN. 
{Co7iiimiedfromp. G3G.) 
THE PHAPvMACOPffilA. 
The portion, called Pharmacopoeia, containing the preparations of the Codex, 
is not arranged alphabetically, but methodically, as in former editions both of 
the Codex and the London Pharmacopoeia, whereby substances, though differ¬ 
ing in name but resembling each other in character, are placed in close proxi¬ 
mity. In the revised edition of the British Pharmacopoeia the arrangement is 
still alphabetical, the Materia Medica and preparations being intermingled. 
There are two classes of products contained in the Codex Pharm., namely, 
those which consist of simple medicaments, furnished by the science of che¬ 
mistry, and those which are of a compound nature, produced by the admixture 
of various substances; the chemicals take precedence, and the galenicals follow. 
Each preparation is numbered, reaching from No. 1 to 862; by this arrange¬ 
ment, if in preparing one article another is referred to as to any part of the 
process, it is done by the number; thus, in preparing the solution of hypochlo¬ 
rite of soda. No. 106, a portion of the work is to be performed as directed in 
No. 105. This part of the work is divided into chapters, and I proceed at 
once to— 
CHAPTER I. 
SIMPLE BODIES. 
The number of these given in the Codex is not large ; they are oxygen, sul¬ 
phur sublimed and washed, precipitated sulphur, chlorine in solution, chlorine 
fumigation, vegetable charcoal, purified silver, iron filings, levigated iron filings, 
reduced iron, grain tin, powdered tin, purified bismuth, purified antimony, and 
pure mercury. 
The cqnivalent weights are given in accordance with the old system, thus, 
oxygen 8, not 16 ; sulphur = 16, not 32 ; carbon = 6, not 12 ; iron = 28, 
not 56 ; tin = 59, not 118 ; mercury = 100, and not 200. I shall give the 
names and synonyms as Codex generally, any deviation wiU be easily recognized, 
and a few only of the preparations will be selected. 
OXYGENE. 0=8. 
1. OXYGENE GaZEUX. 
Gaz Oxygeniiim. 
Oxygen gas is made in the ordinary way from chlorate of potash, without the 
presence of oxide of manganese. 
