DIGESTIVE PROCESSES IN PLANARIA:. 
219 
'05. Nii’enstein, E. — “Beitra<^e ziir Erniilirungspliysiologie dev Pro- 
tisteii,” ‘ Zeits. Allg. Pliysiol.,’ Bd. 5. 
'05. Pratt, E. M. — “ The Digestive Organs of the Alcyonaria and their 
Relation to the Mesogloeal Cell-plexus,” ‘Quart. Journ. Micr- 
Sci.,’ vol. 49. 
’00. Hadzi, J. — “Vorversuche zur Biologie von Hydra," ‘ Arch. Entw. 
Mechanik.,’ Bd. 2’2. 
'07. Jordan, H.— “Die Verdaiu\ng bei den Actinien," ‘ Arch. Gesanimte 
Phys.,' Bd. 110. 
'07. LoiTain Smith. — “ On the Simultaneous Staining of Neutral Eat 
and Fatty Acids by Oxazine Dyes,” ‘ Journ. Phys. and Bact.,’ 
vol. xii. 
EXPLANATION OF PLATE 17, 
Illustratiiio- Mr. G. Aruoltl’s paper on “ Intra-cellnlar and 
General Digestive I’rocesses in I^lanarise.” 
All the hgiu’es, except IJ, are drawn dii’ect, using a 2 mm. oil- 
immersion Zeiss and 8 compens. -ocular. Figs. 9 and 15 with 18 compens.- 
ocular. Fig. 13 i in. Swift and 0 ocular. 
All the figiu’es except 5, which is stained with iron-alum ha;matoxylin- 
acid fuchsin and orange G., are stained with the triple stain mentioned 
in the paper. 
Fig. 1. — A columnar cell from material fi.xed 1 
Fig. 2.— .. .. .. A 
Fig. 3.- .. .. .. li 
Fig. 4.— .. .. .. 3A 
Fig. 5.— .. .. .. Ij 
Fig. 0. — .. .. . 48 
Fig. 7. — ., ., ,. 52 
hour aftei 
hours 
feediiu 
Fig. 8.— Portion of a columnar cell fixed 90 hours after feeding, 
showing pseudopodial ingestion of a leucocyte. 
Fig. 9. — Portion of another cell, same stage as 8 (18 ocular). 
Fig. 10. — A columnar cell from material fixed 118 hours after feeding. 
Fig. 11. — A columnar cell and a gland-cell from an animal starved 
for fifteen days. 
