1862.] 239 



the composition of the acid formed in the second, furnish almost 

 conclusive evidence of the generation of tercyanide of allyle by the 

 action of terbromide of allyle on cyanide of potassium. 



The relation that exists between di- and tri-atomic acids is well seen 

 when we formulate these bodies according to the carbonic acid type: 



2 HO, C 4 H 4 " { & 2 2 1 2 3 HO, C 6 H s '" I < O* I O 3 



L^u 2 J lC a Oj 



Succinic acid New acid 



(bibasic). (tribasic). 



I propose to continue my researches on the cyanides of the di- 

 and tri-atomic radicals. 



II. " Notice of Remarkable Hailstones which fell at Headingley, 

 near Leeds, on the 7th of May, 1862." By THOMAS SUT- 

 CLIFFE, Esq., in a letter to Dr. SHARPEY, Sec. R.S. 



Headingley, July 16th, 1862. 



DEAR SIR, Allow me to offer you some memoranda, which I 

 made at Headingley, near Leeds, on the 7th of May last, respecting 

 a hailstorm which visited several parts of England on that day. It 

 appears that it arrived at Newark about 5 o'clock P.M., and was 

 succeeded by a tornado which did much damage ; then, pursuing a 

 N.N.Westerly direction it reached Wakefield at 6.41. The hail 

 continued to fall till about 6.58. The afternoon at Headingley had 

 been remarkably hot and close, and the atmosphere densely charged 

 with vapour; at 6.45 the sky had become so overspread with dark 

 clouds that it was impossible to see anything within doors without 

 artificial light. There were several peals of thunder and repeated 

 flashes of rose-coloured lightning. The storm visited the villages on 

 the west of Leeds with especial violence, the hailstones knocking 

 down several people, and breaking nearly all glass exposed to the 



w.s.w. 



The hailstones did not fall in a continuous shower, but in irregular 

 clusters ; sometimes a field would be thickly strewed with them, 

 whilst an adjoining one escaped with scarcely any ; one part of a 

 greenhouse would be much broken, and the remainder, similarly 

 exposed, escape uninjured. The district over which hail fell was very 

 narrow. 



To illustrate the force of the falling stones, I may mention that 



