At website
www.curantur.de you can find some remarks for the fourth american edition of Hahnemann's organon by Constantine Hering:
"All homœopathic physicians are united under the banner of the great law of cure, similia similibus curantur, however they may differ in regard to the theoretical explanation of that law, or the extent to which it may be applied.
All homœopathic physicians also acknowledge that provings upon the healthy are indispensable in ascertaining the unknown curative powers of drugs.
And, finally, all homœopaths concur in giving but one medicine at a time, never mixing different drugs together, under the absurd expectation that each will act according to their dictum.
This is the glorious tri-color of our school, which will make the circuit of the world and in these we are as the heart of one man."