244 V. Scillcr: 



waren in ihrer Gestalt den Beelierzellen sehr älnilieh. Lang-ley 

 ist der ^leinung-, dass die Beeher/ellen aus diesen gra- 

 nulären Zellen entstehen. Wird das Tliicr gereizt, tritt 

 an der Oberhaut heftige 8chleinial)sonderung ein; an g\'härteten 

 Präparaten von ausgiehig gereizten Thieren sind IJeeherzellen und 

 granuläre Zellen in viel geringerer Zahl zu sehen. Langley 

 gelaugt zu der Annahme; dass die Granula l)eliut's Sehlei ni- 

 hil düng ausgeschieden Avurden, und dass die Beelier- 

 zellen die mehr oder weniger erschöpften granulären 

 Zellen darstellen, wenn er auch, wie er selbst sagt, dafür 

 keinen sicheren Beweis erbringen kann. Er gielit an, dass die 

 Granula durch Osmiunisäure und nach Miss Greenwood's Aus- 

 sage (überraschender Weise!) durch alle (!) Reageutieu erhalten 

 werden ^). 



1) In the, e.pidcrniis of tlio. \\onii, l)otli transjjavcnt g-nblct ccUs 

 containing' discrete gTanxiles of varying biit gcncrally lari^-c sizc are 



present, the larger g-ranular cells arc in sliajx'. like tlie 



g'oblet cells. . . Apparently Granulär cells üivo i-isc to goblet cells. 

 When a worm is stimulated witli IntcaTUpted slincks, it rapidly socrctcs 

 a nnicous substance. Tf a worin — or j)ortion ol' a \\orm — bc tliiis 

 stiinulatc.d at iiitcrvals dnrinü- an hour nr two, mitil üttlc nr iio so- 

 cretion is obtained, and the be hardeiied it ■will be seeii tliat botli 

 g'oblet cells and granulär cells are iiuich l'ewer in iminber, tVoni the 

 above mcntioned facts it seeins to nie probable that the g-ranules aro 

 tunicd out to form the unicous substance and that the goblet cells 

 are the inore or less eniptied g-ranular cells ))ut I lia\e not been 



able to obtain conij)letely satisfactory proof ol' (Ins Tliey are 



readih' jireserved by osniic acid — and as Miss (rreenwood has pointed 

 out to nie — by nearly all hardening ageiits. 



2) I have niade a few observations upoii nnicous cells in niany 

 othcr positioiis and it ajjpears to nie that iio common acouiit is possible 

 l'or theni all. 1 am inclined to think that the most g'cneral deseription 

 ai)i)lical»le (o them is, tliat orig'inally prolojilasniatii- cells containing- 

 sniall proteid g-ranules form s])heres of inucous substance, tliese may 

 occupy nearly the whole of the cell or leave free a basal porlion.... 

 In some cases the mucous spheres increase at the expense of the linely 

 granulär proto])lasm and run together, so that the protoplasm is Ihen 

 presenl as a netwoi-k running tliroug'h the man of nnicin. The amount 

 Ol' |)rotoplasni left as a network varies in difl'erent cases and it may 

 be nearly, and possible entirely, altsent from the luminar portion of 

 the teils. In other cases the si)heres increase at the expense ol' (he 

 cell substance, without running together. so that they are separated 

 froni one another for the most part by lltiid and not hy cell substance. 



