As the ducts increase in size they are provided with a fibrous coat, and the epithelium in their interior becomes columnar. The interlobular ducts do not anastomose. Sacculi in the Coats of the Ducts. When the fibrous coat reaches a certain degree of thickness it contains numerous little cavities, or sacculi, arranged entirely round the tube in the pig and in most animals, but forming two parallel rows, one on either side of the duct, in the human subject. These little sacculi often communicate with each other in the coats of the duct. The smaller branches of the duct also anastomose frequently, either in the coats of the duct or just external to them. The sacculi appear to serve the purpose of bringing the bile in the thick walled ducts into closer relation with the vessels which surround them, and especially with the branches of the artery which are distributed to their coats. Of the Vasa Aberrantia and of the arrangement of the Vessels around them. In the transverse fissure of the human liver and some others, and in the large portal canals, are found some peculiar branches of the duct, vasa aberrantia, with numerous sacculi on their walls, which anastomose with each other and form a network. In the same localities in the human subject, and in the gallbladder, a very peculiar arrangement of the vessels occurs. Both arteries and veins form a network, and each branch of the artery is accompanied with two branches of the vein, one on either side of it. BIBLIOGRAPHY.* ROLFINKIUS. Dissertatio de Hepate, Jena. F. GLISSON. Anatomia Hepatis, London. 1616-1700. 1616. 1630. BIANCHI. Historia Hepatica, Taurin, 1616, 4to; 1710, 8vo. 1630. 1653. 1654. 1660. 1664. 1666. 1685. 1687. 1692. SYLVIUS DE LA BOE. De Bile et Hepatis Usu, Lugd., Bat. J. WEPFER. De Dubiis Anatomicis, Epistola ad J. H. Paulum, Norimb. HOFFMAN. De Venâ Portæ, Altnorf. REVERHORST. De Motu Bilis Circulari, Lugd., Bat. 1698. STAHL. De Vena Portæ, Porta Malorum, Halle. Pozzi. Commentariolo Epist. pro Gland. Hepat. et Glissoni Caps., &c. WEPFER. De Hepate. 1700-1800. HARTMANN. De Bile, in Halleri Diss. Anat. HELVETIUS. De Structurâ Hepatis, Lugd., Bat. FUCHS. De Vena Portæ, Argent. SALZMANN. De Vena Portæ, in Halleri Diss. Anatom., Vol. III. WAINRIGHT. Anatomical Treatise on the Liver with Diseases, &c., GÜNZ. De Venâ Cavâ, Vena Umbilic. et Anastom. har. Venar. in RUYSCH. Opera Omnia, Amstel. 1739-40. WALTHER. De Venâ Porta. Lips., in Halleri Diss. Anatom., Vol. III. SEEGER. De Ortu et Progressu Bilis Cystic, Lugd. Bat., in Halleri MORGAGNI. Adversaria Anatomica, Lugd., Bat. MOSEDER. De Vesiculâ Felleà, Argent. WESTPHAL. De existentiâ Ductuum Hepatico-cysticorum in Homine, 1745. JUNCKER. Singulari quædam ad Vesicam Felleam ejusque Bilem Spect., Halle, 1745. WOERTMANN. 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De Bilis indole ejusque in Chylificatione utilitate, GOLDWITZ. Neue Versuche zu einer wahren Physiologie der Galle, WALTER. De Structurâ Hepatis et Vesiculæ Felles, Annot. Acad. WALTER. De Polyp. Uteri et Hepate, Berlin. RICHTER. Expl. Circa Bilis Naturam, Erlangen. THILOW. De Vasis Bilem ex Receptaculo ad Renes Ferentibus. SEMMERING. De Corporis Humani Fabrica, Vol. VI. NIEMEYER. Comment. de Commercio inter Animi Pathemat. Hepar Bilemque, &c., Gottingen. MURRAY. Reply to Froelich, Delineatio Sciagraphica Venæ Portæ, METZGER. Anatomia Hepat. Comparatae Specimen, Regiom. DOMLING. Ist Die Leber Reinigung's Organ? Vienna. 1800-1856. 1801. BICHAT. Anatomie Descriptive, Paris. 1803. PORTAL. Cours d'Anatomie Médicale, Paris. 1810. HOEULIEU. Descript. Anat. Syst. Ven. Port., &c., Francfort. 1817. SCHUMANN. Diss. de Hepatis in Foetu magnitud. caus. ejusd. functioni, Vratisl. MAPPES. Dissert. de Penitiori Hepatis Humani Structurâ, Tubingen. FELICI. Osservaz. Fisiologich. Sopra le Funzioni della Milza, Vena WALTHER. Diss. de Psychica Hepatis Dignitate, Halle. BICHAT. Anatomie Générale, Paris. MASCAGNI. Prodromo della Grande Anatomia Firenze. 1822. BELTZ. Quædam de Hepatis Dignitate, Berlin.. 1825. 1828. J. F. MECKEL. Manuel d'Anatomie, Générale, Descriptive, et Pathologique, translation by Jourdain and Breschet. Dictionnaire de Médecine, art. Foie. 1830. 1833. 1834. 1836. 1837. 1838. 1839. 1841. Ueber die Rindsubstanz der Leber, in Reil's Archiv., ROOSE. Physiolog. Untersuch. Ist Galle im Blute ? WOLF. De Vesiculæ Felles Humanæ Ductus, &c., in Act. Acad. PLATNER. Super Vulgari Doct. de Funct. Hepat., &c., Questiones MÜLLER. De Glandularum Secernent Struct. Penit., Berlin. VOISIN. Nouvel Aperçu sur la Physiologie du Foie et sur l'Usage de la Bile, Paris. KIERNAN. The Anatomy and Physiology of the Liver, in the Philosophical Transactions. CRUVEILHIER. Anatom. Descriptive, Paris. BERRES. Anatomie der Mikroskopischen Gebilde des Menschlichen KRAUSE. Ueber den feineren Bau der Leber, in Müller's Archiv., BURDACH. Physiologie, translation by Jourdain, Paris. DUJARDIN et VERGER. Recherches Anat. et Micros. sur le Foie des HENLE. In Hufeland's Journal, p. 8. E. HALLMAN. De Cirrhosi Hepatis, Berol. LAMBRON. Mémoire sur la Structure intime du Foie, Archiv. Générales de Médecine, 1841, 3a série. 1841-42. W. BOWMAN. Article, "Mucous Membrane," in Todd's Cyclopædia of Anatomy and Physiology. E. H. WEBER. Annot. Anat. et Physiolog., Prol. VI., VII., VIII., Lips. KRAUSE. Handbuch der Menschlichen Anatomie, Hannover. TODD and Bowman. The Physiological Anatomy and Physiology of A. KRUKENBERG. Untersuchungen ueber den feineren Bau der J. MÜLLER. Uek er den Bau der Leber, Anmerkung zur Krukenberg- E. H. WEBER. Ueber den feineren Bau der Menschlichen Leber, SCHLEMM. De Hepate et Bile Crustaceorum et Molluscorum quo- THEILE. Art. Leber, in R. Wagner's Handw. der Phys. II., St. 308. BACKER. De Structura subtiliori Hepatis Sani et Morbosi, Diss. SCHRÖDER VAN DER KOLK. In Backer's Essay. KRAUSE. Ueberden feineren Bau der Leber, in Müller's Archiv., 34 St. 24. ARNOLD. Handbuch der Anatomie des Menschen. 1846. HANDFIELD JONES. On the Secretory Apparatus of the Liver, Philosophical Transactions, p. 473. HASSALL. The Microscopical Anatomy of the Human Body in Health H. MECKEL. Mikrographie einiger Drüsenapparate der Niederen NICOLUCCI. Sulla Struttura interna del fegato in Filiatre Sebezio, LANGENBECK. Mikroskopisch-Anatomische Abbildungen, Göttingen. WILLIAMS. On the Physiology of Cells, in Guy's Hospital Reports, 2 ser., Vol. IV., p. 283. ERASMUS WILSON. Article "Liver," in the Cyclopaedia of Anatomy and Physiology. QUAIN and SHARPEY. Elements of Anatomy. NATALIS GUILLOT. Sur la Structure du Foie des Animaux Vertebrés, WHARTON JONES. Microscopic Examination of the contents of the HANDFIELD JONES. On the Nerves of the Liver, London Medical LEIDY. Researches into the Comparative Structure of the Liver, HANDFIELD JONES. 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