CORRESPONDENCE OF RAY. 253 



box, and a flying one to her, which, fluttering with his 

 wings, did presently, in his sight, march to the creeping 

 one, and couple with her. How this can accord with 

 what Mr. Waller delivers of the winged Cicindelce, that 

 they are both male and female, and couple together, I see 

 not, unless we say that there are two sorts of flying glow- 

 worms, the one sort having both sexes flying, and the 

 other being the male of the creeping ; for Dr Plot's salvo 

 will not here serve the turn, viz. that the animal in which 

 Vintimiglia made the first experiment might be prurient 

 with lust, and being shut up in a glass with creeping 

 glowworms, might couple with them, as horses do with 

 she-asses ; for in our case the flying glowworm was not 

 pampered, as wild creatures seldom are, nor withheld 

 from those of his own kind for some time, and was at 

 his free liberty in the box to take his flight away. 



B. N., July 8, —92. 



Mr. Lhwyd to Mr. Ray. 



Honoured Sir, — When yom- last letter came I was 

 at London about a legacy of books, medals, and pictm'es, 

 bequeathed by Mr. Ashmole to the University, since 

 which time I have been so continually employed in taking 

 a catalogue of them, that I have had but small leism-e to 

 go abroad to make any discoveries. 



My discoveries in formed stones of late are but few. 

 1 have a stone almost a foot long (but broken in several 

 pieces), something of the colour, shape, and politeness of 

 a rhinoceros's horn, which, perhaps, is congenerous with 

 that they call IJnicornu fossile ; and have also found at 

 Witney and Charlton, in Oxfordshii-e, and Farringdon, 

 in Berkshire, several very odd petrified bones, to me at 

 present unaccountable, and like to continue so, at least- 

 wise a long time. At present I only suspect them to be 



