F. H. Stewart 
205 
Experimental Records relating to the development of the Egg of A. lumbri- 
coides in Human Faeces. 
Date 
Day 
Nature of experiment and result of examination 
Expt. 1. 
21 vm 
0 
Stool containing eggs placed in an open bowl covered with wire 
gauze in the open air 
24 „ 
3 
Eggs mostly unicellular. Few irregularly segmented. 
27 „ 
6 
Eggs in condition of advanced segmentation. 
31 „ 
10 
No signs of further development—many degenerated. 
Expt. 2. 
21 „ 
0 
Eggs washed out of the same stool as used for Expt. 1, and 
placed in a damp atmosphere. 
1 IX 
11 
Eggs contain vermiform embryos. 
Expt. 3. 
21 vm 
0 
Same stool as in Expt. 1. 
22 „ 
1 
Ditto. 
23 „ 
2 
Eggs washed out and kept in foul water. 
24 „ 
3 
Eggs transferred to a damp atmosphere. 
1 IX 
11 
No development of eggs. 
13 „ 
23 
Eggs contain vermiform embryos. 
Expt. 4. 
21 vm 
0 
Same stool as in Expt. 1. 
24 
—■i ,, 
3 
Eggs washed out and placed in a damp atmosphere which 
became fold smelling. 
1 IX 
11 
1-2-4-cell stages and stages of more advanced segmentation. 
2 
12 
Transferred to a damp atmosphere; not foul smelling. • 
13 „ 
23 
Eggs contain vermiform embryos. 
Expt. 5. 
21 vm 
0 
Same stool as in Expt. 1. 
27 „ 
6 
Eggs washed out and placed in a damp atmosphere. 
31 „ 
10 
4-cell stages to curved vermicides. 
Expt. 6. 
21 „ 
0 
Same stool as in Expt. 1. 
31 „ 
10 
Eggs washed out and placed in damp atmosphere. 
13 ix 
23 
Eggs: some unsegmented, some with curved vermicides, some 
with vermiform embryos. 
Expt. 7. 
24 viii 
0 
Eaeces containing eggs in open bowl covered with wire gauze 
in open air. 
27 „ 
3 
2-6-cell stages. 
4 ix 
11 
Faeces dried. Eggs degenerated. 
Development of the Egg in the Faeces of the Pig. 
Date 
Day 
Nature of experiment and result of examination 
Expt. 8, 
19 vm 
0 
Faeces of pig containing eggs placed on squares of card-board 
on the ground and covered with perforated tins. 
24 „ 
7 
Eggs in condition of advanced segmentation. 
26 „ 
9 
Eggs contain curved vermicides. 
1 IX 
15 
One specimen has become very wet from heavy rain, almost all 
the eggs are degenerated. Another specimen has remained 
only moderately damp, eggs contain vermiform embryos. 
Parasitology x 14 
