produced or developed in all vegetable 

 substances, in the processes of acetous 

 fermentation, especially in rice. The ex- 

 istence of such a compound is, however, 

 still doubtful. 



ZUMOL'OGT, from utnj, ferment, and 

 Xoyo?, discourse. The doctrine of fermen- 

 tation. 



ZujiosiM'KTER.from tKAfl><ns, fermenta- 

 tion, and [AiTcut, to measure. An instru- 

 ment invented by Swammerdam, for 

 ascertaining the degree of fermentation, 

 occasioned by the mixture of different 

 liquids, and the degree of heat which 

 becomes sensible during the fermentation. 



ZT-J-S'NA. A genus of lepidopterous 

 insects of the family Crepuscnlaria, Cuv., 

 The caterpillars live exposed on variou* 



Z Y 1 



leguminous plants. Also, a genus of cai- 

 tilaginous nshes of the shark tribe. 



ZYGODA.C'TYLOCS, from &?<><*, to join, 

 and dotzTuko;, a finger. Having the toes 

 joined in pairs. Applied to birds having 

 the toes disposed in pairs, as the parrot. 



ZYG'OMA, from yycf, a yoke. The 

 name given by anatomists to the cavity 

 under the zygomatic process of the tem- 

 poral bone and os malae. 



ZTOOMAT'IC. Appertaining to the zy- 

 goma. Zygomatic process is the apophysis 

 of the os jugale ; and another of the tem- 

 poral bone, is so called. 



ZYTHOG'A.Li,from &9of, beer, an 

 milk. A mixture of beer and roilk ; th 

 old beverage known by the nar e of pet- 

 -drink. 





