with an Account of a Descent into Eldon Hole. 173 



in the upper valley, are not then to be seen in any part of Eldon 

 Hole, but probably course in an easterly direction on the north side 

 of Eldon Clough and Peak Hill. 



The subterranean waters are first met with at Speedwell Mine, 

 in which the excavations, at a distance of 760 feet from the en- 

 trance, terminate in a platform, upon which the waters fall from 

 a lofty cavern, and are again precipitated over a perpendicular cliff. 

 The water has been allowed to accumulate in the line of the former 

 workings, and the curious are obliged to navigate in a little boat 

 to this interesting and striking spot. 



The platform is stated to be 353 yards from the perpendicular 

 surface, and the elevation of the abyss, into which the waters throw 

 themselves, and which has been plumbed 103 yards, and into which 

 much rubbish and broken rock has been cast, in ineffectual at- 

 tempts to fill up the chasm, will not be much greater than that of 

 the farthest extremity of the Peak cavern, into which the waters 

 are found flowing. This latter cavern, of gigantic dimensions at 

 its entrance, being about 87 yards high at its immediate opening, 

 can be penetrated to a very considerable distance, part of the course 

 being through caverns with natural contractions and curious devia- 

 tions from the simplicity of a mere water course, and part along 

 the sometimes muddy and sometimes stony banks and bed of the 

 stream, which having entered by an impassable opening, and finally 

 bubbles forth at an increased depth a very little to the left of the 

 great entrance. 



But our limits do not now permit of further details. We must 

 return to this " Wonder of the Peak" in a future number, the pre- 

 sent descriptions being supposed to be confined to Eldon Hole, 

 whose interest lay as much in the mystery that was attached to its 

 dangerous descent, as in the important relations which it bears to 

 the other caverns of the Peak. 



ART. IV. On the Double Type of the Respiratory Organs, as 

 illustrated hy Professor Rathkes Discoveries. ( With a Plate.) * 



(Communicated by T. W. Jones, Esq. Lecturer on General Anatomy.) 



. Taking into consideration the co-existence of lungs and giUs in 

 the Proteus, and reflecting on the circumstance that, in fishes, 

 there are bones connected with the gills, whose analogies in the 

 other classes of animals have not been determined, Dr. Knox was 



• For the accompanying plate, we are indebted to MM. Saigey and Raspail's 

 valuable Annates. 



We have requested our friend, Mr. Jones, to furnish us with an abstract of the 

 important discovery of Professor Rathke, as the notices which have been already 

 published in this country are in a great measure useless, from not being acconi- 

 panied by the author's illustrative figures. 



