108 WINN ON STORMS. 



scribed by the authors, nor are there pores either in the vessels or 

 the cells. Frequently what are alleged to be pores are nothing 

 more than the remains of a spiral tube, or of small bulgings thereof 

 remaining permanent when the spiral character has disappeared. 



a, a, a, Remains of the doublings of the spiral vessels in the Balsam plant, in form of pores. 



The annular vessels again, first described by Bernhardi, and con- 

 founded by M. De Candolle with the pseudo-tracheae, are altogether 

 different j being produced by the rounds of a spiral tube becoming 

 at first detached and again united to form a ring, it being not unu- 

 'sual to find one part of a vessel or spiral tube changed into the 

 annular form, while another part remains unchanged. The beaded 

 vessels are only vessels turned, or folded with narrowings at the 

 foldings. Coloured fluids readily pass these narrowings. 



ON STORMS PREDICTED FROM THE APPEARANCE OF THE 

 AURORA BOREALIS. 



BY CAPTAIN WINN. 



I HAVE often wished, that somebody would carefully collate a 

 sufficient number of meteorological journals, with intent to observe, 

 and class the several appearances in the atmosphere, before great 

 changes in the weather, particularly before great storms. I am per- 

 suaded, from my own observation, that in general sufficient indi- 

 cations of impending tempests precede them a considerable time, 

 did we but carefully note them. The phenomenon which I am going 

 to mention is one of those indications, which not only portend an 

 approaching tempest, but serves to ascertain from what quarter it 

 will come j a circumstance that may render it of essential service 

 to seamen. I believe the observation is new, that the Aurora Bore- 



