488 A. B. DAWSON 
Be bitectsrotsiahteandybackeroun dim eee ie ae ester een eee 520 
[SelnochersAm phi: «425 haem ea lee Cee een ne cee 520 
Der ING Cts! evs Stee ooo eke Ie oe Oe ns Orie ee ae 521 
CPU TechsyOhstempe»racure +): wees Seer Cree sme ene eee eee 522 
einvother Am plitb 1a: 5 sirte steers cicee oe eae oe eee ele cee Cane eee 522 
MyM AIN GS CEUT US «fois haat eee eee i ee ea tee Dire ees eat en 523 
Dmiittects olcadremallim 2 ee wie ony aes eters itis oe iar eee 524 
Be Mechanismorscontracklone sia aman ae ance cetera ena 524 
1 in other, -Aanplibisy 2 eee ie tose nes aes ey ae Renken ee ee 524 
22 Ins NG CHUTUS He x seree ce eile oe oe alma I en Ce eae 525 
Golan dS sss Glyde kee Be | Se a aeons Scr Sono AU Ons ook en ee ea 526 
AS HD bROGUTCHIOM EE alc cen eter ieee oy rae Ie aie ea eee 526 
B. Evidence of the presence of two types of glands................... 528 
Ie Whiberature brea Seek Oat eer ene ee AIO Oe ane ner ee 528 
2-aMorphol py: seers hese ies Hanes aes ea rere 529 
a sDistnibutionytormyandspOsivionrass ease eee eer 529 
by Hustolocicalstructurer. pea-a rere cee ornate eee 530 
AMD UC. Sad oe ROSE RO ee eRe Ee Ere eee 530 
b)kintercalany region yer) + esa ee eee pn ee a 531 
cy Gland? alveoliuss et ae oh ei ee eee 2 oe 532 
d) Muscles of granular glands............... es Si ee 533 
e) Muscles of mucous glands...... SERENE Caen te a 534 
f) Epithelium and secretion of granular glands *-'ree 535 
g) Epithelium and secretion of mucous glands.......... 537 
3Development 45 62: 1yetiosen ane O80. aco ei ade eee 539 
anincother Amphibiasy asics 2 ofa ee ete eres 539 
bs Harky stages*im Neéchunus ss:o0. 2420. ce a oeenee een corer 540 
c. Differentiation of the granular gland.................... 542 
d= Differentiation of thesmmucous flan peace meee seen 547 
As Physiology: ..c.2: d4 Sods Rae ee een eee 549 
as Of the granularoland aah... vc. css ce eee oe eee 549 
b. Of the’ mucous*eland! Jae. ato ee eee eee 552 
Cio Maxed sg lam al siiyiict.c) i seve ate tite, cre cs ea se Oe Oa ee 554 
f. Invother: Amphibia: Pecos ieee. ies eee tomes pa ere sno ieee 554 
PPM Dav eX C] FUN GULL uae ee REALE IA ot A ROR NSP ed xe cola Nn) SHR RIO oc 555 
DP WReweneration sen tee oo co Aine aos Aol: Aa eee ee Tee Te ee 558 
t ,Of granulariglandss, cs ¢tRas Ries Ve ers ee eee 558 
a. In other Amphibia...... Avia teehee en SM ky 558 
bs In NeCtUrUsyta 3 stie comnts + Com Toe ree eee 560 
2: Of mucous glahnds5 a? face edo. Wee ee one 562 
a. In.other-Amphibia js.5 ein eee ne ence 562 
be Tn Nec hurulsis o:t/s..< scree Scheie hice eee etna oe aie 563 
Tngervation 6.5.5 eutectic eave fei Sonia te aS A cate he ee 564 
UMAMIATY. 0k LGD aad does Pee tuk HAE oe ES Se SEC RMT LT Ie ee 565 
Bibliography 's.co 5 sides, ee ee FAs AOU ee RE are ree eee 569 
Pl atese ec eee ee ee RRR OR OTT ee il 
