326 [Dec. 18, 



the other toes are all thicker on the side turned towards the middle 

 toe. That of the second toe is almost as square as that of the third ; 

 but the distal angles of that of the third and fourth are bevelled off 

 on the fibular side, while the terminal phalanx of the hallux is 

 similarly bevelled off upon the tibial side. The metatarsal bones 

 have the same thick prismatic form, and the proximal phalanges the 

 same discoidal character as in the fore foot. 



The calcaneal process is directed outwards at an angle of 45 from 

 the axis of the foot, arid must have been much raised in the natural 

 position. 



While the work of restoration, whose results have just been briefly 

 detailed, was going on, we learned from Dr. Falconer that a nearly 

 entire specimen of a Glyptodon was exhibited in the Museum at 

 Turin. An application was at once made to the authorities of the 

 Museum for information, and, if possible, for photographs of this 

 skeleton, and was responded to with the most obliging readiness. 



These photographs of a skeleton in some respects more, in others 

 less perfect than that of the College, have confirmed the conclusions 

 already arrived at in the most satisfactory manner; and I trust 

 before long to be in possession of descriptive details of parts of this 

 specimen which are wanting in our own, and which will enable me 

 to complete the anatomy of the skeleton of the gigantic extinct 

 Armadillo. 



II. "On the "Relation of Aqueous Vapour to Radiant Heat." 

 By JOHN TYNDALL, F.R.S. &c. Received November 20, 

 1862. 



(Abstract.) 



The object of this paper is to prove to meteorologists that they 

 may apply, without misgiving, the results which the author has already 

 announced, regarding the relation of aqueous vapour to radiant heat. 

 The author describes new experiments made with dry and humid air, 

 first, with an experimental tube stopped by plates of rock-salt ; 

 secondly, with an open experimental tube ; and thirdly, with an 

 arrangement in which both the plates and the tube were abandoned, 



