42 PROCEEDINGS OF THE LINNEAN SOCIETY OF LONDON. 



iu the IVTorth of England. It is of considerable interest, as 

 having made Linne and Haller friends again after a misunder- 

 standing. 



Mr. Middleton also stated that he had recently had an 

 opportunity of examining the fine series of letters from Linnaeus 

 in the British Museum, 45 in number, viz. : — 



2 early ones to Sir Hans Sloane, 1736, 1737 ; 



1 to da Costa, 1759 ; 



2 to Solander, 1760, 1762 ; 



3 to Carburi, 1763 ; 



37 to Gouan, 1765 to 1771. 



45 



Of these, one only (that to da Costa) appears to be printed in 

 Smith's ' Correspondence.' One to Gouan (1766) has a pencil 

 drawing of Siren lacertina. All are dedicated and signed at the 

 beginning (like the one to Haller above quoted) until December 

 1768, when the first signature at the end occurs. One (12th 

 December, 1770) is dated at the top, according to modern custom. 



June 16th, 1904. 



Calculi from the Horse. By R. Beooks Popham, F.L.S. 



The stones, presented to the owner by the late Mr. Young, 

 M.E.C.V.S., were obtained post-mortem. The two largest are 

 from an animal used in a coal-cart, a smaller specimen broken up 

 (not shown) proved the nucleus to be composed of a small piece of 

 coal, evidently eaten with the food. The animal died of enteritis. 



The third stone, with all the loose ones, are from another 

 animal, showing facets well marked, and the nucleus in one broken 

 open. Over a hundred of these smaller ones may be sometimes 

 found in the same horse. 



The ordinary intestinal concretion of horses is the triple 

 phosphate, and invariably with a foreign body for a nucleus — a 

 pebble for instance, — and are found in stomach, caecum, or other 

 part of intestinal canal, the phosphate of magnesia contained in 

 wheat, oats, and hay helping to the production. Another 

 common method of formation is the swallowing of hair from the 

 coat of animals repeatedly licking themselves, forming " hair-balls," 

 which are covered by earthj^ crust and found in the stomach and 

 alimentary canal of cows, goats, etc. In the Royal Coll. of 

 Surgeons Museum there is one of this description measuring 

 40 inches iu circumference. 



