VOL. XLIII.] PHILOSOPHICAL TRANSACTIONS. l65 



concussion, and break the glasses ? Shall it be said, it is because they are not 

 elastic ? copper, iron, silver, and ivor)', are elastic ; and as much so as flint and 

 porcelain, and surely much more so than the end of one's finger. 



It appears that, before we undertake to give the solution of these phenomena, 

 we should apply ourselves to the making a much greater variety of experiments 

 about them; that we should both try a greater number of glasses, and those with 

 a greater variety of differing bodies, that we may be able thence to collect at last, 

 in what classes the several bodies are to be ranged, that are either fit or unfit for 

 these purposes : and then it may perhaps be time to inquire, whether it is from 

 the principles of chemistry, or from those of mechanics, or any other branch of 

 natural philosophy, that we are to seek for the reasons of the several facts. 



The president (Martin Folkes, Esq.) and the R. S. also repeated the same 

 experiments, with the like success, both foreign and English phials, made as 

 before. 



Mr. Allamand observes, that he had yet only tried these experiments on phials 

 made of white or crystal glass. But the president since received from the Rev. 

 Dr. Littleton, f. r. s. some large hollow cups, made at Worcester, of the com- 

 mon green bottle glass; all which, though of a much greater size than the others, 

 and some of them above 3 inches thick at bottom, were instantly broken with a 

 shiver of flint, weighing only 1 grains , though they had before resisted the shock 

 of a musket-ball from the height of near 3 feet. 



On some Improvements which may be made in Cyder and Perry. By the Rev, 

 Henry Miles, D. D., F. R. S. N° 477, p. 5l6. • 



The design of communicating the following paper to the Royal Society is, to 

 invite gentlemen, after the example of a practice that has long obtained in Here- 

 fordshire, to attempt an improvement of their waste lands, by planting such kind 

 of fruit trees, as are mentioned, in hedges and barren places ; which, for aught 

 appears, would thrive as well in other counties, perhaps in some parts of most 

 counties in England, as in that of Hereford. 



Extract from a manuscript, written Anno 1 657-8, by Dr. John Beale, p.r.s. 

 concerning an excellent liquor made of a mixture of rough pears and crabs. — 

 The author undertakes to evince, " That crabs and wild pears, such as grow in 

 the wildest and barren clifts, and on hills, make the richest, strongest, the most 

 pleasant and lasting wines that England yet yields, or is ever like to yield." — " I 

 have so well proved it already (says he) by so many hundred experiments in Here- 

 fordshire, that wise men tell me, that these parts of England are some hundred 

 thousand pounds sterling the better for the knowledge of it." 



He mentions, of these kinds of austere fruit, the Bareland pear and the Brom- 

 sbury crab, of which notice is taken page 4th of the tract entitled Herefordshire 



