ADDENDA. 



Page 6. Add to Note ft It should be observed, that the compla- 

 nation or flattening of the reliquiam only takes place when 

 its posifibn, in respect to its length, is parallel with that of the 

 laminae of the inclosing substance. If the fossil be an elongated 

 or lengthened body, as the stem of a plant, &c. and its direc- 

 tion perpendicular, or nearly so, to the slaty structure of the 

 surrounding stone, it always retains the original bulk of the 

 prototype. I have observed this phenomenon repeatedly, in the 

 shales and gritstones of Derbyshire, Lancashire, and Cheshire. 

 Vide, also, Jameson's Elem.of Geogn. p. 181. 



In Note f, it is observed that rock-salt sometimes occurs in 

 strata abounding in extraneous fossils. This is asserted on vari- 

 ous authorities. V. Kir wan G. Ess. p. 373. In England, 

 however, I believe neither marine nor any other kind of orga- 

 nic remains have been found in the strata which accompany 

 rock-salt At least, so I judge from my own observations, and 

 all the information I have been able to obtain from others on 

 the subject, during a residence of some months at Northwicii; 

 Cheshire. 



Page 25. Add to Note on the Neptunian Theory I have to 

 regret my not receiving a copy of Professor Jameson's exposition 

 of the Wernerian Geognosy till the present sheets were printed 

 off. It would have enabled me to have avoided a few errors, 

 I have been led into, from the view taken of the prevailing 

 Neptunian system of Geology by others the chief of these, 

 however, are perhaps the following. 



Prop. 9. Obs. " The diminution in the height of the water 

 is accounted for, by supposing the ocean began to retire gradu- 

 ally into the internal cavities of the earth/' The reader may 

 suppose from this statement, that th^ Wemerian opinion on tie 



