oi5 Molls' System Cry stailogr apt ly 
Example II. — Required the Correct Time of High Water at Leith on Novem- 
ber I. 1820, the Moon being in Apogee ? 
Time of the Moon’s passing the meridian, - - 21** 28' 
Correction in the Table corresponding to 21** 28', - - 
Time of the Greatest Action of the Sun and Moon, » 22** 3' 
Art. VI. — Outlines of Mohs's Nezo System of Crystal- 
lography and Mineralogy. (Continued from Vol. III. 
page 342.) 
IV. Mineralogieal System. 
1. Difference between the Natural History System of Mine^ 
oology and every other . — As the natural history system of minera- 
iogy deviates entirely from all previous systems, it will be neces- 
sary to shew that its deviations are nothing else than consequences 
from the universal principles of natural history. They regard, 
1st, The form, 2d, The content (inhalt) of the system. 
2. Dfect in form — No mineralogieal system is known that 
has not a defective form. The defects of mineralogieal systems, 
in regard to form, are of two kinds. In first place. Those 
systems do not contain within them the essential steps of collo- 
cation or subdivision, genera and species ; in the second place. 
The application of such steps as they do contain is not univer- 
sal, and consequently the form is not the same throughout the 
whole system. 
3. Continuation . — As to the^r,s^ objection, it frequently hap- 
pens, that where the species is settled according to the natural 
history plan, the genus is not so settled:; and that where the ge- 
nus is chemically settled, the species, at all events not chemically 
settled, is sometimes settled by natural history, frequently by good 
luck. Each of those two conceptions thus belongs to a different 
science, — one of them occasionally to no science at all. Hence if 
the system is observed from a point of view connected with the 
one of those sciences, the conception of Genus is wanting; if from 
a point of view connected with the other, the conception of Se- 
cies is wanting. But a system to be observed under two points of 
view, or a system with two aspects^ is itself a contradiction to logic. 
In this respect the Wernerian system is especially remarkable. 
In the class of Metallic Minerals, it really contains a sort of che- 
tmical genera, (the others only profess to be so) ; in the class of 
