rOL. XXiy.} FHILOSOPHICAL TRANSACTIONS. 1 QS 



from M to p, and from n to o; but I could not find one single canal that was 

 perpendicular, or can be said to proceed from the root. These forementioned 

 canals have no thorough passage, and it seems that in each canal there are S€ 

 many valves as there are horizontal vessels in them. At ab is represented a lint 

 running quite across, and something incurvated, which is that part of the cork 

 where, the season of the year being over, a stop was put to its growth. 



For further satisfaction, I cut another piece of a cork after the same manner, 

 so that whereas in the foregoing figure, the horizontal canals were represented 

 in the length, now the same canals were cut across. Fig. 17 represents a small 

 piece of cork, as it appeared through a microscope that was more magnifying 

 than the former in fig. 13, from which this piece of cork was cut oflr) between 

 B and G, and was that part which was next, or united to the tree, and from 

 whence it received its increase; and consequently those canals which in fig. l6 

 were cut longwise, were now across. Here we perceive that almost all those 

 parts that were cut across did not consist of round canals but of hexangular 

 ones, which is agreeable to the most perfect order, because it prevents any va- 

 cuities taking place between them. 



Concerning the Vitrified Salts of Calcined Hay. By Mr, Leuwenhoeck, F.R,S. 



N° 296, p. 1856. 



A large hay-rick in Salisbury Plain was reduced to ashes by spontaneous com- 

 bustion. These ashes were found to consist of saline particles,* forming " a 

 light glassy stuflfand very brittle, which when walked over, cracked and broke 

 under the feet ; and when put into the mouth had a salt taste." 



On Insects in the Bark of decaying Elms and Ashes. By Sir Matthew Dudley^ 



F.R.S. N°296, p. I859. 



About 5 or 6 years since I transplanted several elms more than 6 inches dia- 

 meter, which for the first 2 or 3 years all thrived very well; but 2 or 3 years 

 ago, there happening a very dry time in July or August, I observed one of 

 those elms, which stood very shallow, and on pretty high ground, looked very 

 sickly ; the leaves turned yellow, and began to fall off; which made me with a 

 knife examine the bark, when I found the inside not so green, but of a redder 

 colour than the rest; and between it and the tree not so moist, and the bark; 

 sticking very close to the wood ; but what was most remarkable, I discerned a 

 great many small black flies -f- of the beetle kind, viz. having a hard case, under 



• Potashes or vegetable alkali, with carbonaceous matter and other impurities, 

 f Dermestes polygraphus. Linn. 



VOL. V. Co 



