B. Owen— Existence or not of Horns in the Dlnocerata. 401 



The formation of this salt, together with the lead salt, shows 

 that from this acid both monobasic and dibasic salts can be 

 formed. 



The formula of the acid is CgH, 3O7 and in the oxidation of 

 the glycogen we can assume that the following reactions take 

 place: C,H, „0,+H30+2Br=C,H,20,Br,. Adding silver 

 oxide to the bromine compound we have : 



C,H, ^OgBr^ -fAg,0=C,H, 3O, +2AgBr. 

 From analogy, it would seem proper to apply to this acid the 

 name glycogen acid. 



The preceding analyses and reactions show conclusively that 

 by the action of bromine, water and silver oxide on glycogen, 

 an acid is formed which bears the same relation to glycogen as 

 "dextronsaure" to dextrin. On comparing this acid with the 

 descriptions of " gluconsaure "* and " dextronsaure, "f we see 

 that the glycogen acid differs from the two no more than the 

 two differ from each other. There is also the same relationship 

 existing between glycogen acid and the acid or acids obtained 

 by the oxidation of amylum and paramylum:}: by Haberman, 

 which latter show but few points of difference from " glucon- 

 saure "and "dextronsaure." 

 February 26th, 1876. 



Aet. lAL—On the existence or not of Horns in the Dinocerata ; 

 by Richard Owen. (Letter to the Editors of this Journal, 

 dated London, Feb. 24, 1876.) 



Gentlemen : Among the new forms of extinct Eocene mammals 

 of America, for which science is indebted to Professor O. C. 

 Marsh, those which he refers to "the new order Dinocerata'' are 

 the most singular. 



The study of their characters, especially as described and illus- 

 trated in your Joumal,§ has led me to s ' " " 

 subject of " horns. " These weapons in 

 ported by bone, are either " autogenous " 

 "epiphyses" or "apophyses;" terms wh 

 either, that the horn is ossified from an i 

 fl 



§ Yol. 3 



;, p. 163. 



