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XLII. A Letter from David Mac- 
bride, M. D. to John Walfh, Ffq\ 
F. R. S, accompanying two Letters 
from Mr. Simon to Dr. Macbride, 
concerning theRevivifcence of fome Snails 
preferved many Years in Mr. Simon’s 
Cabinet. 
To JOHN WALSH, Efq; 
DEAR SI R « Dublin, 22 Jan. 1774,, 
Redde,May5,'|' Inclofe to you two letters, which I re- 
*774- ceived from Mr. stuckey simon, 
concerning that extraordinary fadt in Natural Hi- 
ftory, which you feemed to regret had not been 
fufficiently authenticated to be communicated to 
the public, in the Phiiofophical Tranfadtions of 
laft year. — The Royal Society are undoubtedly in 
the right to be extremely cautious of allowing 
any thing, fo very much out of the hitherto-ob- 
ferved courfe of nature, as this is, to appear in 
their publications, without the fulleft evidence. 
In 
