The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . rce he has applied theterm of Divellent affinities. It is plain therefore that a doubledecomposition can only be effected where the sum of thedivellent is superior to that of the quiescent attractions. Takingthe instance above adduced, Dr. Henry* has placed this sub-ject in a very clear point of view, thus— The attraction of Lime to Muriatic acid . = 104Soda to Sul
The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . rce he has applied theterm of Divellent affinities. It is plain therefore that a doubledecomposition can only be effected where the sum of thedivellent is superior to that of the quiescent attractions. Takingthe instance above adduced, Dr. Henry* has placed this sub-ject in a very clear point of view, thus— The attraction of Lime to Muriatic acid . = 104Soda to Sulphuric acid . = 78 Quiescent affinities =182 The attraction of Soda to Muriatic acid . = 115 Lime to Sulphuric acid . == 71 Divellent affinities =186 The original compounds, therefore, are preserved by aforce equivalent to 182, and the tendencies to produce newcompounds are represented by the number 186. The divel-lent affinities are consequently predominant. Dr. Cullen,with whom the happy idea of representing what passes inthese complicated changes by diagrams, appears to have ori-ginated, proposed as an illustration, two cross sticks, movea-ble on a pivot (a) placed at their point of intersection, thus— A B 115. * Elements of Experimental Chemistry, Edit. 9. JPARISS MEDICAL CHEMISTRY. l&J If, on mixing the compounds denoted by A C, B D, theattractions of A to B, and of C to D, overcome the quiescentattractions A C, B D; the resulting decomposition is at oncerepresented by bringing together the extremities AB, CD;by which, also, the production of the two new compoundswill be denoted by the conjunction of these letters. 236. It must be acknowledged that the theory of chemicalaffinity, as above displayed, is highly captivating, as wellfrom its extreme simplicity, as from the apparent facility withwhich it may be brought to bear upon questions of practicalinquiry ; but the student has yet to learn, that there existnumerous extraneous circumstances which are constantlyoperatin
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