4934. 
strate an existent connection between this optical activity of these 
antipodes and their enantiomorphism ? 
As will be seen in the following, it must now be considered as 
a very remarkable fact, that the occurrence of enantiomorphie forms 
with these antipodes, can be stated in a few cases only, while in 
most of the cases studied not only could no argument be given to 
make the existence of such enantiomorphism probable, but it could 
be even demonstrated to be absent, as follows from the certain 
occurrence of holohedrical forms in these crystals. 
We are thus compelled to suppose, — in contradiction to the now 
still universally accepted doctrine about the necessary connection 
between the optical activity of crystals and the mere “‘axial’’-sym- 
metrical molecular arrangement of their crystal-structure, — that 
erystalforms can correspond to such optically active substances, 
whose symmetry appears to be holohedrical; just as the reverse is 
‚the case e.g. with crystals of dextro- and laevogyratory sodium- 
chlorate, where the enantiomorphic molecular structures are built 
up by optically active molecules. 
Properly speaking, — of all the salts of this series, only in the 
vases of the nitrates and of the perchlorates could it be demonstrated 
beyond doubt, that a “hémiédrie non superposable” really occurred. 
In all other cases it was not present, or possibly, notwithstanding 
the enormous optical activity, — so feebly revealed itself, that no 
rational proof of its existence could be given: on the contrary, in 
the cases of the /odides and rhodanides all evidence was certainly 
present in favour of a true holohedrical symmetry. 
Also all experiments, made with the purpose of varying the crystal- 
habitus by the admixture of other salts in the solutions, in such a 
way that mere “axial’’-symmetrical crystalforms would appear, were 
without any positive result as far as this problem is concerned. 
The crystals of the dextro-, and laevogyratory bromides e.g., 
remained identical under the most varied circumstances : in solutions, 
containing sodiumbromide for instance, more needle-shaped crystals 
were obtained, which were however again the same for the two anti- 
podes and evidently represented no other than holohedrical forms. 
As far as our experience now goes, it would be only dogmatical, 
to persevere in the doctrine of the necessary axial-symmetrical nature 
of the dextro-, and laevogyratory crystals in cases like these, where no 
argument could be brought in favour of that supposition, while there 
are many indications just against the occurrence of enantiomorphic 
forms. 
