VOL. XXVI.] PHILOSOPHICAL TRANSACTIONS. 531 



scope, some of them appeared like fig. 6. This appeared at first surprising ; 

 but when I considered, that the particles of sugar, some of which are many 

 thousand times smaller, so small, indeed, that they escape the sight through a 

 microscope, do not appear to the eye in the same position, nor that their wedges 

 are represented as in fig. 4, by bc or gf, but on the contrary, the side which is 

 described in the said figure by cdefik lies sometimes uppermost or undermost; 

 then it is not surprising, if the same particle of sugar-candy shall appear to the 

 €ye as in fig. 7. 



In that particle of sugar above-mentioned, I observed several streaks or fibres 

 that lay inwards, and which, by reason of the transparency of the sugar, ap- 

 peared plainly to the eye, as shown in the said fig. 7, between d and c, and d 

 and E ; and so likewise from the centre of the sugar, where those streaks ex- 

 tended on each side to b and p. From this observation I concluded, tha« the 

 sugar increased from time to time, in proportion to the spaces between /each 

 streak or fibre. 



I likewise saw a few coagulated sugar particles, that appeared in complete 

 quadrilateral figures, one of which is represented fig. 8, and. was as clear and 

 transparent as any diamond. It must also be observed, that these figures 6, 7, 

 8, were not larger than a small grain of sand. In the middle of fig. 6 and 8 

 was a very clear particle, of the same figure with the whole body ; from whence 

 appears, that the said whole body was much smaller at its coagulation, but in- 

 creased continually by new accessions of matter round about it ; and thtt in pro- 

 portion to the number of perimeters, the body increased in size from time to 

 time. 



These little figures preserved their complete forms and crystalline appearances 

 as long as it was dry weather ; but when it happened to be moist or rainy, we 

 observed moisture about the particles of the sugar, which in dry weather eva- 

 porated again ; and then there coagulated an infinite number of small sugar 

 particles upon the greater, and those were so exceedingly small, that a thousand 

 of them together were not so large as one of those particles before represented 

 in fig. 6, which was itself not so large as a single grain of sand. Now since 

 we see that from one and the same matter two different figures are coagulated, 

 it is easy to conceive that several other figures might be produced in the first 

 coagulation, especially when any of the parts of those little bodies lie upon 

 each other ; and therefore also we should not wonder, to see, in the coagulation 

 of salts, several figures produced out of one particle of salt. 



I formerly shewed the circulation of the blood in an eel, by putting the eel 

 into a long glass tube, with the tail uppermost : but I have left off that way for 



3 Y 2 



