XXXVIII BULLETIN NO. 23, UNITED STATES NATIONAL MUSEUM. 



was written by an American, Professor Dana, and that he used that 

 worlv as liis! text-book. On parting he very kindly told Dr. Lea that 

 he would gladly be of service to any of his friends who should visit 

 Oxford. 



Dr. Lea visited the remarkable ancient remains of Stonehenge, sup- 

 posed to be of Druidical origin. The formation here is the Chalk, while 

 the huge stones, of which there are ninety-four, are either Sandstone 

 or Archaic, except the "Slaughter stone," which is slate, and said by 

 Dr. Buckland to have been brought from Wales. The larger stones are 

 said to weigh 45 tons. The geological structure from the Coal at Bristol 

 to this locality is Lias, Oolite, and Chalk. 



Keturning to London Dr. Lea visited the Museum of Economic Ge- 

 ology,* but found both his friends De la Beche and Forbes were oat of 

 town. Mr. Bailey, assistant to the ordnance survey, very kindly offered 

 his services, and took him to the cases he wished to see. They went 

 over the collection of the New Eed Sandstone formation, which Dr. Lea 

 found to be equivalent to that of Pennsylvania. In the private room Mr. 

 Bailey introduced ]\Ir, Morris, the well-known author of the " Catalogue 

 of British Fossils." He mentioned that Dr. Mantell had invited him the 

 previous year to meet Dr. Lea, but he could not come, as he had an 

 engagement. He pressed Dr. Lea to visit him at Kensington. They 

 went over the mollusca brought by the Eattlesnake in her voyage to 

 South Africa, &c. 



Dr. Lea met here Dr. Price, professor of chemistry in the Royal College, 

 whom he had previously seen at Hull, at the late meeting of the British 

 Association. He invited Dr. Lea to dine with the Eed Lion Club the 

 following Thursday, which invitation was accepted. A few days after 

 Dr. Lea went again to the Museum of Economic Geology, taking with 

 him some specimens of Unionidce and some volumes of his works which 

 he had promised. He was glad to find that Sir Henry de la Beche had 

 rv'turned, and he expressed great jileasure at seeing Dr. Lea again, and 

 thanked him for the valuable present which he had made to the institu- 

 tion. They talked over the New and Old Eed Sandstones, and Dr. Lea 

 explained the position in the series of the " foot-marks " {Sauropus 

 p7imccviis) found by him near Pottsville, Pa. Sir Henry said that "the 

 thing was perfectly clear," and " it was a capital hit." As to whether 

 the formation was Devonian or not, that was a different question; it 

 was fixed in Professor Eogers's No. XI,t and that was the point." Sir 

 Henry observed that there was great difficulty about these Eed Sand- 

 stones. In speaking of the New Eed Sandstones he said they were 

 entirely unsettled as regarded the British locality, that the strata were 

 much altered after deposition by subsequent denudation, and the j) res- 

 ent deposits were therefore much confused. He made Dr. Lea a dia- 

 gram by which it would appear difficult to distinguish one member of 

 the Permian from another. 



* Since changed to Eoyal School of Mines, 

 t See page 70. 



