VOL. XXII,] PHILOSOPHICAL TRANSACTIONS. 603 



from other blood-vessels ; and when the particles of blood are a little crowded 

 together, or when one of those longish vessels are somewhat bended, it appears 

 to the sight, as if one saw a thick cloud. The eyes are surrounded with this 

 cloud of small particles, but more at one time than another, for some are dis- 

 persed, and then others arise in their stead, on viewing these vessels with their 

 globules of blood, through one of my glasses against a candle, or other strong 

 light, they seem to be in a continual motion ; by which, those particles that are 

 in the tunica cornea, be their motion ever so small, seem to us as if they were 

 moving in the air ; but by a strict examination we shall find, that they are one 

 and the same particles, which sometimes appear ascending, and at other times 

 descending. 



It has often happened too, when I looked against a strong light, through my 

 microscopes, that I saw a vast number of exceedingly small particles, that had all 

 a glittering motion. These I imagine are in the crystalline humour of the eye, 

 between the tunica cornea and the crystalline, the motion of which small particles 

 is occasioned by pressing the tunica cornea, when we shut our eye close together. 



I have often taken several sorts of moist matters, and laid them on a very 

 clean glass, and viewed them, as also the breathings of my mouth ; and by the 

 help of my microscopes I could see their fine subtile parts rising up from the 

 glass like clouds, and at last quite vanish, so that I could not perceive the least 

 remnant of them ; and finally, I am absolutely of opinion, that though I could 

 see the effluvia of bodies, that were a thousand millions of times smaller than 

 those, yet I should not be able to perceive the perspirations of bodies, and 

 much less the imaginary influences of the stars. 



A new Kind of Walnut-tree, discovered by Mons. Reneaume, of the Royal 

 Academy of Sciences. N° 273, p. g08. 



The walnut-tree, or nux juglans sive regia, has been described by many 

 authors, who, however, seem to have known only six species of it, though I 

 can reckon nine. They confounded with the common sort, that which the 

 country people call noix Angloises, which one may call nux juglans putamine 

 durissimo, which appears to me to be that which in Hermolaus, and in the 

 Historia Lugdunensis, is called moratiae moracillge, and which Caesalpin calls 

 surdae. Besides, the same authors have distinguished another species, which 

 might be called nux juglans fructu praecoci, because they are sooner ripe than 

 the others, and eaten about the feast of St. John en Cerneaux, which has given 

 them, among the country people, the name of noix joannettes. As for that 

 species I am to treat on, I cannot find any author that knew of it, and there- 

 fore I shall call it nux juglans, folio eleganter dissecto, or acanthi-folia. 



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