ERUATA, No. 16 ;. 
( 
The author of the paper on the Wernerian System has sent 
Oie the following corrections and addition. 
Page 150 line 12 the comma after " Pentland-hills.” 
151 4 for '‘strata disposed,” rear/ “strata are 
disposed.” 
152 l6-i; dele the comma after “ veins,” and insert 
one after “ granite." 
153 12 and 1 for “ two of sandstone,” read 
marginal note. J “ three,” &c. 
154 15 for newest flcetz-trap,” read “ new'est 
flcetz-trap formation.” 
15Q 31 for ** alluvicc,” read alluvial," 
Note, to be added at foot of 227, by reference from line 4. 
f The propriety of separating the transition rocks from those 
of the floctz-class, appears, in fact, to rest on the practical ne- 
cessity of distinguishing formations of such extent and impor- 
tance from the remaining members of the arrangement. By 
the remarks in the text, it is not so much intended to deny the 
convenience of this separation (to judge correctly of w’hich 
would require more extensive opportunities of observation than 
the writer has enjoyed) as to shew, that upon this point the 
arrangement is at variance with the theory, and that, even in a 
practical view, it may require more distinct elucidation than 
it has yet received. 
