EXERCISE IIT. 
THE EARTH-WORM (Lumbricus campestris), 
Sub-kingdom—ANNELIDA. Class —OLIGOCH ETA. 
1, Take a good sized worm, place it in a tumbler of water, 
and add a few drops of corrosive sublimate dissolved 
in alcohol.* When dead, take it out and roll it in 
blotting-paper to remove the mucus. 
2. External characters.—The body is composed of between 
100 and 140 segments, all nearly similar except the 
two first, and the clitellwm, which is composed of 
five or six segments, commencing in a full-grown 
worm about the 20th. The first segment — the 
cephalie lobe—is sub-conical, with a depression on 
the lower surface, close to the second segment, which 
is the mouth. The second segment—the buccal 
segment—is completely divided on the upper side. 
On the anterior portion of the lower surface, openings 
will be seen between the ninth and tenth segments, 
* Or the animal may be killed with chloroform, or by putting it in 
a “killing bottle’? made in the following way:—Take a wide-mouthed 
bottle that is well stoppered, lay on the bottom a few pieces of cyanide of 
potassium (a deadly poison) each about the size of a pea, and pour over 
them plaster of Paris, mixed with water and well stirred until it is of the 
consistence of thick cream, until well covered. If the stopper is good, 
this bottle will last for more than a year, and will kill all air-breathing 
animals put into it, such as insects, lizards, mice, &c. When the poison 
gets too weak, add another layer of cyanide and plaster of Paris on the 
top of the old one. ; 
__ Chloroform keeps better in an inverted corked bottle than im ome 
with a glass stopper. The animal should be placed in a glass stoppered 
bottle, and a few drops of chloroform added. 
