336 MAMMALIAN ALVEOLINGUAL SALIVARY AREA 



looked, principle of morphology is enunciated. He notes that in the 

 case of the salivary glands, as in many others, attention has at first 

 been directed to adult conditions, and then to the earUest stages of 

 development, "Es giebt jedoch in Lebenslaufe dieser Organe einen 

 mittleren Abschnitt, iiber welchen man gewohnhch mit einem Sprimge 

 hinwegsetzt. Es war meine Absicht, eine solche Strecke durch 

 stufenweise Beobachtung durchzumachen, aber zuerst musste ich 

 mich natiirhch mit dem zu beiden Enden dieser Strecke liegendem 

 Terrain personlich bekannt machen. ..." He then gives a concise 

 summary of the Kterature and his own observations upon adult ma- 

 terial (man, pig, ox, rat, dog, cat, and rabbit). He used the celloidin 

 corrosion method of Schiefferdeker, and wax injections of the ducts 

 as a preliminary to dissection. His conclusions are in accord with the 

 observation of Cuvier and the results of Reichel, as to the presence of 

 two glands and a gland series in the alveohngual region, which he 

 designates respectively : Glandula submaxillaris, Glandula subhnguahs. 

 Glandule alveololinguales (lesser sublinguals). He further finds the 

 massa sublinguaKs (das Driisen conglomerat der gesammten Glandula 

 sublingualis autorum) to be compounded of the lesser subhnguals, 

 the Bartholinian element, and sometimes "ein contingent . . . welches 

 von eiuigen aus dem Ductus Wharton, kommenden Aesten herstammt. 

 Solche sind von Meckel erwahnt ; ich habe selbzt sie selten aber sicher, 

 mittels Injection durch den Ductus Wharton, constatirt. In einem 

 Falle, wo ich einen solchen Ast auf der einen Seite beobachtete, fand 

 sich ausserdem beiderseits eine Gl. subhnguahs s. str." (i.e. a sub- 

 hnguahs major). He then reports in detail his findings in a series 

 of pig embryos (17 milhmeters - 7 centimeters), and a series of human 

 embryos (6 weeks to 12 weeks), together with brief, but important, 

 observations upon individual embryos of the mouse and rabbit. His 

 results may be briefly summarized. In both man and the pig he found 

 the submaxillary arising from the Ungual sulcus caudal to the Ungual 

 nerve, and thence advancing by means of an epithelial keel, subse- 

 quently freed by constriction. From the primitive anlage growth 

 proceeds proximad as a crest, distad as a free-growing sprout, wluch 

 enters and divides in the circumscribed mesenchyme condensation, 

 which forms so conspicuous an object in sections of the submaxillary. 

 He further noted the intimate relations of the duct to the submaxillary 



