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(c) Section of Ton2'ue showing Fungiform Papil- 



lae. 



Portions from the posterior part of a dog's tongue, known to 

 contain fungiform ])apilke, were liardened in mercuric chloride, 

 stained in Delatield's h;eniatoxylin, embedded in paraffin, and sec- 

 tioneil at riglit angles to the long axis of the tongue. The sections 

 were fixe<i to cover glasses and counter stained in eosin, deh3'drated, 

 and cleared in oil of bergamot and xylol. Mount on l)Mlsam. 



Study first under low power. Search for the broad 

 conical projections of the mucosa, composed of a rather 

 dense fibrous tissue on which man}' secondary })a[)illse are 

 seen. Tliey are covered with stratified pavement epitlie- 

 lium. Many filliforni })apill£e will also I)e seen in this 

 section. Observe the arran_<);eraent of the muscle fibres. 

 The preparation will also show arteries, veins, and nerves 

 in section. Sketch one fungiform papilla as seen under 

 hiuh power. 



(d) Taste Buds. 



The jiapilia foliata of a I'abbit wa? iiardenod in mercuric 

 ciiloride, stained in Delalield's lurmatoxylin, emljedded in paraffin, 

 and sectioned at riglit angles to the transverse ridges seen on the 

 inijiilla. .Mount in bals.im. 



The taste buds are embedded in the epithelium lining 

 the furrows between the ridges. In the muscular and con- 

 nective tissue below the papilla foliata small serous glands 

 will be seen in section. Sketch two ridges with the inter- 

 vening furrow and taste buds as seen under high power. 



(e) Mucous and Serous Salivary Glands. 



Small pieces taken from tiie submaxillary and parotid glands 

 of a dog were hardened in mnrcuri(! chloride, pieces of each gland 

 embe<lded side by side in paraffin (so that one section will pass 

 through t)oth glands), and sectioned. The sections were then fixed 

 to cover glasses, stained in Haidenhain's iron-lack-hcT?matoxylin, 

 dehydrated, and cleared in oil of bergamot and xylol. Thus on 

 each cover glass are sections of both submaxillary and parotid 

 glands. Mount in balsam. 



Study first under low power. The less deeply stained 

 section is the mucous (submaxillary) gland. Both glands 

 have the same general structure. The acini are grouped 

 into lobules which are held together by a loose fibrous tis- 



