1902.] NATURAL SCIENCES OF PHILADELPHIA. 359 



EXPLANATION OF PLATE XVI. 

 All figures drawn by the aid of the camera lucida X 600. 



Fig. 1. — Median cell from intestine of PorcelUo scaber, fed with raw- 

 beef; intestine fixed after 24 hrs. in Hermann's fluid (24 lirs.) and 

 washed in water for 24 hrs. Sections stained in 15 per cent, acid- 

 fuchsine in aniline water. Alb. Gr., albumose granules. 



Fig. 2. — Median cell from intestine of PorcelUo scaber., fed with raw 

 beef; intestine fixed after 24 hrs. in 95 per cent, alcohol (24 hrs.), 

 washed in lower grades and finally in water 15 hrs. Sections stained in 

 15 per cent, acid-fuchsine in aniline water. Albumose granules washed 

 out. Nucleus shows eS'ects of unilateral penetration of the fixing fluid. 



Fig. 3. — Median cell from intestine of PorcelUo scaber, fed with raw 

 beef; intestine fixed after 50 hrs. in Hermann's fluid (24 hrs.), and 

 washed in water 24 hrs. Alb. Gr., albumose granules. 



Fig. 4. — Median cell from intestine of PorcelUo scaber^ fed with raw 

 beef; intestine fixed after 50 hrs. in 95 per cent, alcohol (24 hrs.), and 

 washed in water 15 hrs. Albumose granules washed out. The nucleus 

 is distorted by the fixation. The mass which occupied the concavity of 

 the nucleus previous to washing may have contained albumose. Com- 

 pare fig. 3. 



Fig. 5. — Two per cent, peptone (depur. sice, aus Fibrine, Griibler) 

 precipitated on cover-glass with Flemming's strong fluid. Washed in 

 running water 6 hrs. Stained in 7 per cent, acid-fuchsine. 



Fig. 6. — Two per cent, serumalbumen and 2 per cent, deuteroalbumose 

 (Griibler) (equal parts) precipitated on cover-glass by Hermann's fluid, 

 washed in running water G hrs., and stained in 7 per cent, acid-fuchsine 

 in aniline water. Cg., coagulum of albumen ; Alb. Gr., albumose gran- 

 ules. 



Fig. 7.— Two per cent, serumalbumen precipitated by 1 per cent. IlgClj 

 and washed in running water 6 hrs.; then impregnated with 1 per cent. 

 Deuteroalbumose 2 hrs. and again precipitated by Flemming's fluid (24 

 hrs.), and stained in 7 per cent, acid-fuchsine in aniline water. Cg., 

 coagulum of albumen ; Alb. Gr., albumose granules. 



Fig. 8. — Median cell from "mid-gut" of Oniscus asellus, fed with raw 

 beef; intestine fixed after 20 hrs. in sublimate-acetic. Sections stained 

 in Biondi-Hiedenhain. xirt., artifact caused by unilateral penetration of 

 the fixing fluid (see p. 305); Alb. Gr., albumose granules. 



Fig. 9. — Median portion of the typhlosole from intestine of PorcelUo 

 spi/iicornis, fed with raw beef; intestine fixed after 24 hrs. in sublimate- 

 acetic. Alb. Or., albumose granules. 



Fig. 10.— Two anterior cells from intestine oi PorcelUo scaber, fed with 

 olive oil and fixed after 24 hrs. in 1 per cent, platinic chloride 15 pts., 1 

 per cent, osmic acid 4 pts. Sections stained in 10 per cent, acid-fuchsine. 

 All black granules are fat. 



