264 VHILOSOPHICAL TRANSACTIONS. [aNNO 1728. 



author of the Natural History of Poland, it seemed to him to be the dens 

 exertus of an elephant. 



In the notes on the last edition of Dr. Herman's Cynosura Medica, published 

 by Dr. Boeder of Strasburg, under the title of Unicornu Fossile, mention is 

 made of a remarkable piece of fossil ivory, or rather of an elephant's tooth, in 

 the hands of Jaques Samson de Rathsamhausen de Ehenweyer, an Alsatian 

 nobleman. It was found in the Rhine on one of his estates near Nonneville, 

 and was 3 feet 3^ inches in length, Paris measure. It was near a foot at the 

 basis in circumference, where thickest, and about 8i inches at the other extre- 

 mity. It was filled within with a sort of marl ; but the outer surface was stony 

 in some places, and bony in others. The bony part scraped, or burnt, smelled 

 like ivory. The scrapings boiled made a sort of jelly. The author of the 

 notes adds, that they find fossil ivory in several parts of Europe, particularly in 

 the Schwartzwald (Sylva Hercynia) in Moravia, in Saxony, and near Canstad 

 in the duchy of Wirtemberg. 



A Method for determining the Number of impossible Roots in Affected Equa- 

 tions. By Mr. George Campbell. N° 404, p. 515. 



The substance of this paper, as well as of some others in the Philos. Trans, 

 may be found in several other publications : as, in Stirling's Lines of the Third 

 Order ; in Maclaurin's Algebra, and in several others. 



Observations on the Stomachs of Od'en. By Charles Price, Esq. of Trinity 

 College, Oxon. N° 404, p. 532. 



In the stomach of a cow Mr. Price found two things well worth observing. 

 1. That the villi composing the villous coat, (which in men are so very small 

 as to be scarcely visible when examined separately) are in this animal so very 

 large, as to allow an exact scrutiny into their structure. Each villus is formed by 

 a duplicature of the internal lamina of the vascular coat; from which it receives 

 3 blood vessels, as represented in fig. 1 5, pi. 4, which shows one of the villi 

 of the stomach of an ox magnified. Whether the two side-vessels are arteries, 

 and the middle-vessel a vein ; and whether those small branches arising from 

 the side-vessels are secretory ducts, carrying a fluid from those arteries into the 

 cavity of the stomach, making a kind of rivus perpetually running through 

 the ductus alimentalis, he leaves others to determine. 



The other thing remarkable in the stomachs of these large animals is, that 

 their internal surface is covered by a production of the cuticle, which descends 



