TOL. XLVnr.J PHILOSOPHICAL TRANSACTIOWS. 345 



But the cold is often more intense than this, as appears by the experiments made 

 at Kirenginshi, where its sharpness was so great that Professor Gmelin with dif- 

 ficulty staid at the door of his house between 3 and 4 minutes. 



Feb. 10, 1/38, at 8 in the morning the mercury stood at 240 degrees in De 

 L'Isle; which is 72 below in Fahrenheit. At the same place in 1736, Dec. 

 11, at 3 p. m. 254 in De L'Isle, almost QO below in Fahrenheit, Dec. 20, at 

 4 o'clock, p. m. 263 in De L'Isle = 99 tVo- below O n Fahrenheit. 



Jan. 9, 1735, 12 at noon, 275 = 113 -rVir- 



Jan. 6, 6 in the morning, 280= 120 below in Fahrenheit, and 152 be- 

 low his freezing point. 



Such an excess of cold could scarcely have been supposed to exist, had not 

 these experiments demonstrated the reality of it ; and Professor Gmelin assures 

 us, they were made with all possible exactness, and agree with many others made 

 in different parts of Siberia by his direction. 



It was not apprehended that a greater degree of cold existed any where than 

 that artificial one produced by Boerhaave, by means of ice and concentrated spirit 

 of nitre, which sunk the mercury 40 degrees below O i Fahrenheit's thermo- 

 meter ; and this was supposed to be the point, beyond which no animal could 

 bear it : and Gmelin's account is the more extraordinary, as the French acade- 

 micians under the polar circle mention the greatest degree of cold, observed by 

 them, to be by Reaumur's thermometer 37 degrees, which nearly corresponds 

 with 70 degrees below the O in Fahrenheit's. 



XFII. A Catalogue of the Fifty Plants from Chelsea Garden, presented to the 

 Royal Society, by the Company of Apothecaries for the Year 1752, pursuant 

 to the Direction of Sir Hans Sloane, Baronet, p. 1 10. 

 [This is the 3 1 st presentation of this kind, completing to the number of 1550 



different plants.] 



XVIII. Observations on a Remarkable Coralline.* By Mr. John Ellis, p. 115. 



This coralline he received from Mr. Collinson. It appears, from its size and 

 firmness, to belong to a warmer climate than this, and is probably American. 

 Some of the same genus, but of a different species, are found in our own coasts ; 

 but they are smaller, tenderer, and more transparent. There is one particu- 

 larly, called by Dr. Dillenius, in the 3d edit, of Ray's Synopsis, p. 37, N°. 20, 

 tab. 2, fig. 1, corallina pumila erecta ramosior : and in Buddie's Hortus siccus, 

 in the late Sir Hans Sloane's collection, there is a specimen like it, but not so 



• Cellaria neritina. Ellis. Sertularia neritina, Linn. 

 VOL. X. Y Y 



