36 



JOURNAL OF THE PLYMOUTH INSTITUTION". 



LUNAR RAINBOWS. 



Although I have witnessed many of these, not one, I believe, has 

 ever been observed when the moon was less than 4 or 5, or more 

 than 25 days old, her light at these ages being probably insufficient 

 for their production. Por this reason, and because she is so often 

 and so long above the horizon during daylight, her rainbow must be 

 much less frequent than that of the sun. 



Seldom or never has a brighter lunar rainbow been observed than 

 that which was seen at Plymouth and Devonport, about eight 

 o'clock on the night of Sunday, the 19th of December last, exhi- 

 biting the prismatic colours most distinctly and clearly. The 

 bright moon, not a day after the full, was then shining on an un- 

 usually dark cloud during a very showery night of heavy hail and 

 rain. 



As a great many persons must have seen it whilst returning from 

 their places of worship, and as some of them may have observed 

 whether it was or was not accompanied with a secondary bow, how- 

 ever faint, the notice of such an observation would be a desideratum. 



Ed. Edmonds. 



MEMORANDUM. 



Early in December, 1869, some hazel nuts in excellent preserva- 

 tion were found about 1 8 feet below the surface in Tregilso Stream 

 "Works, in Saint Hilary. The formation of the ground in the 

 stream works is described by workmen employed in it as 

 Surface mould. 

 Clay. 



*'Rab," ''Shingle," ''Run," or Waterworn stone. 



"Turfy," qy. Peat. 



Stream tin stuff. 



The nuts were found in the "turfy" formation. This stream 

 work lies in the valley between Hayle estuary and Marazion 

 marsh. 



The workman who found the nuts and gave the above informa- 

 tion states, that some few years ago he worked in a stream work 



