394 Miscellanies. 



two other caves described by Mr. Christol, seem, from his account, 

 to contain bones of the human species, mixed with those of Hyae- 

 nas, in caves to which it seems there can have been no Post-dilu- 

 vian approach ; as they were entirely filled with gravel, so that no 

 one could ever have gone in to bury them : and I place much reli- 

 ance on the observations of Mr. Christol ; as he is aware of the dif- 

 ficulties of an examination of the contents of a cave, and as I know 

 his skill, from having been myself engaged with him in examining 

 the bones in the cave of Zunel. 



36. Opinion of Prof. Buckland as to the Heidelberg collections of 

 Geological specimens, noticed in the last T^oL of this Journal. — ^I 

 should recommend you to apply to Professor Leonhard of Heidelberg, 

 who has an establishment there for making general European Collect 

 tions in Geology, to be sold at a very moderate price. One of his pu^- 

 pils has been lately in England, and I believe has made collections 

 from many of our English strata, to form part of his European series, 

 which I believe will be very good, and very cheap. 



JS'otices, translated and Extracted by Prof. J. Griscom. 



37. Cements for iron water pipes. — M. Gueymard, in an interest- 

 ting statement of the introduction of water into the city of Greno- 

 ble, says that the mastic which he has employed to connect the pipes 

 has been known for some years, by the name of Aquin.- Most of 

 the recipes vary, and those which he had obtained directly from 

 Vienna, Lyons, Paris, and by correspondence from London, do not 

 answer his purpose. For this reason he commenced a series of ex- 

 periments, and found the following composition, acquired the hard- 

 ness and compactness of good cast iron. 



I mingle ninety eight parts of cast iron filings (pounded turnings) 

 passed through a coarse seive, and not oxidized, with one part of flow- 

 ers of sulphur. When intimately mixed, I take one part of sal-am- 

 pioniae, and dissolve it in boiling water ; and pour this solution on the 

 preceding mixture and agitate it thoroughly. The quantity of water 

 ought to be such as to reduce the whole to the consistency of com^r 

 mon mortar. 



This cement disengages a great quantity of heat and ammonia, 

 find should be immediately used. It is pressed forcibly into the 

 Joints, and after drying two or three days in the open air in summer, 



