Prof. Oersted on the Compressibility of Fluids. 201 



part of its surface, which is little changed, but a wound in one 

 spot discovers that internally the ivory is decomposed into a 

 brittle substance, dry and adhering when applied to the tongue, 

 purelv white, but exhibiting the decussating circles peculiar to 

 ivory. Its weight is ninety-seven pounds. The whole coast 

 presents fossil remains. At Cromer, Trimingham, Barton, 

 Walcot, Harborough, Waxham and Winterton, teeth and bones 

 of one animal or other have been dug from the clay exposed at 

 low water. A fragment of a jaw with its tooth was in 1820 dug 

 from the bottom of the cliff at Kessingland in Suffolk, and at 

 the mouth of the Harwich river considerable quantities of 

 bones have been found. In 1820 at Horehead by Norwich the 

 entire skeleton of the great mastodon was discoverd in the 

 gravel close above the chalk, and by it the remains of an ele- 

 phant. That it was a mastodon, is proved by the grinder now 

 in your possession, and thus it makes a valuable addition to the 

 list of Mammalia whose fossil remains enrich this neighbour- 

 hood. I am, my Dear Sir, Yours very faithfully, 



James Layton. 

 To Dawson Turner, Esq. Gr. Yarmouth. 

 Catfield 28th December 1826. 



Art. III. — On the Relative Compressibilities of different Fluids 

 at High Temperatures. By H. C. Oersted, Professor of 

 Natural Philosophy in the University of Copenhagen, F. It. S. 

 Lond. and Edin. and Correspondent of the Institute of 

 France. Communicated in a Letter to Dr Brewster. 



Having in the course of last summer performed a very great 

 number of experiments on the compressibility of different fluids, 

 and particularly on the compressibility of water at high pres- 

 sures, I am now about to calculate the corrections which must 

 be introduced for the variations of atmospherical pressure, 

 temperature, &c. As soon as the paper is finished I will send 

 you a translation of it. The following results, however, will 

 not be much affected by these corrections. 



1. As far as the strength of my apparatus has permitted 

 me to push the compression of water, (viz. seventy times that of 



