022 PHILOSOPHICAL TRANSACTIONS. [aNNO 1683. 



cut through, and marked by HHH. The 2d sort which lie far asunder, as in 

 proportion D from G, and are marked out in their length by DC: these vessels 

 are likewise very small, and accordingly the rising vessels lie very close to each 

 other; they are likewise cut asunder across, as I, I, fig. g. Also, KKK are the 

 great rising vessels cut asunder longwise : which I generally observed to be be- 

 set with small parts, that through a common magnifying glass seemed to be 

 globules. 



Fig. 10, ABCD represents a little piece of willow wood, as large to the 

 naked eye as fig. F. The same consists also of two sorts of rising vessels, small 

 and great ; the large ones beset with little parts, seeming globules. In the 

 same I saw bending lines which heretofore I imagined to have been valves, as is 

 represented fig. 11, in one of the same rising vessels marked by G. These 

 small rising vessels have exceedingly thin films, which it was impossible for me to 

 delineate with red chalk, so finely as was requisite. In this wood I saw but one 

 sort of horizontal vessels, marked by EEE. These vessels are but few in com- 

 parison of the horizontal vessels, which I hitherto have observed in other woods. 

 The same are not far extended in length, and for breadth they lie single. 



Fig. 1 1, HHH is the same vessels cut across, represented between the rising 

 vessels, being at their length. In one of the great rising vessels GG, I like- 

 wise showed that they are beset with little parts seeming globules, but they are 

 exceedingly small. 



Fig. 12, is a piece of alder-wood, the breadth of which is about the thickness 

 of a hog's bristle to the naked eye. It consists likewise of two sorts of rising 

 vessels ; the smaller of which consists of exceedingly thin films, and the larger 

 sort of films beset with little parts extremely small, to which you can give no 

 other names than globules. Between AB and CD is the increase of the tree in 

 a year's time. EEEE are the vessels which run horizontal. 



Fig. 13, FF are the great rising vessels cut through longwise. HH are the 

 small rising vessels. GG the horizontal vessels cut across. 



Fig. 14, ABCDEF is a little piece of black Mauritius ebony wood, exhibited 

 by a microscope magnifying more than any of the former; because these vessels 

 could not well be observed by the ordinary glasses; and this little piece of wood, 

 wherein are shown about 1100 rising vessels, is no larger than to be covered by 

 an ordinary grain of sand. I purposed at first to have drawn this wood more at 

 large, having intended to have shown its decrease in the latter end of the year, 

 and increase at the beginning of the year or spring : but in my attempting I 

 found that my labour would be frustrated, because that wood grows in a climate 

 where it increases always : for the island of Mauritius lies in a few degrees north 

 of the tropic of Capricorn. In this wood I am persuaded there are four sorts of 



