VOL. XXX.] PHILOSOPHICAL TRANSACTIONS. 423 



to be 1082,1 . A second piece from the blood of a different person gave 1086,] . 

 A third from the same person gave 1086,6. 



Hence it follows that the specific gravity of the blood globules, is at least 

 1084, which is the medium among these five experiments. 



But if we allow one half of the bulk of the crassamentum to consist of serum, 

 filling up the spaces between the blood globules, we shall find their specific 

 gravity to be 1138. 



From this we must make a small abatement, because some part of the serum 

 must have been squeezed out from between the globules, by their yielding to 

 each other's pressure, when the lump of crassamentum lay upon the paper: 

 and this will reduce their specific gravity sufficiently near to 1126, as we had 

 before determined it, 



yin Account of the Sunk Island in the River Humher, some Years since recovered 

 from the Sea. By John Chamherlayne, Esq. F. R. S. N° 36l, p.*1014. 



This island goes by the name of the Sunk Island, so called I suppose from 

 the sinking marsh ground about it. As for its original, several old people here 

 can remember when there appeared nothing of it, but a waste and barren sand; 

 and that only at low-water, when for the space of a few hours it showed its 

 head, and then was buried again till the next tide's retreat : thus it continued 

 until the year 1 666, when it began to maintain its ground against the attacks of 

 the waves; about which time it began to be rescued wholly from future danger, 

 by the care and industry of Colonel Gilby, who having a lease or gift of it from 

 the crown, raised banks about the rising grounds of it, and so defending it 

 from the encroachments of the water, it became firm and solid ; and in a short 

 time afforded good pasturage for sheep and other cattle. 



This island is now about Q miles in circumference, within the banks, which 

 seem to render it impregnable against all future attacks of the sea, and is of a 

 very fat and fertile soil, affords good grass, corn and hay, and is replenished 

 with numerous flocks of sheep, which are of a larger size and finer wool than 

 those in Holderness, from which it is divided by about 2 miles in water, and 

 from Lincolnshire by about 4. It is stored with vast numbers of rabbits, which 

 seem innumerable ; their skins are counted the finest in England, and are of a 

 dark mouse colour, shagged, and soft as silk. There are also cows and horses 

 feeding constantly in the place, with great plenty of wild fowl. There are 

 however only three families that live constantly upon the place. 



The yearly income of the proprietor Mr. Gilby, amounts to about 800l. It 

 lies nearer to the diocese of York, bv at least 2 miles, than to that of Lincoln, 



