IN MYRIAPODA AND INSECTA. 
293 
takes place to a very great extent. Secondly, that very severe wounds also are fre- 
quently healed ; as, for instance, those attendant on excision of an entire limb. 
Thirdly, that protrusion of the viscera takes place from small wounds when these are 
in the line of action of the principal muscles of the body. Fourthly, that the healing 
of wounds in these animals depends, in the first instance, on an arrest of the haemor- 
rhage by coagulation of the effused blood, and the formation of a clot, as in the Ver- 
tebrata. Fifthly, that coagulation is a property of the blood in these Articulata, ex- 
actly as in the Vertebrata. Sixthly, that coagulation is not so complete in the 
former, but begins to take place in nearly the same time as in the latter. Seventhly, 
that a complete union of the wounded parts takes place beneath the eschar formed by 
the clot on the wounded part. Eighthly, that after this union the injury begins to be 
repaired by the development from the injured surface, of parts corresponding to 
those which have been removed. Ninthly, that at least one change of skin is neces- 
sary to the production of a new limb, when the injury has been severe, or the entire 
limb has been removed. That the removal and reproduction of a part, and the 
healing of the wound, do not prevent, although they certainly retard, the natural 
changes of the animal ; and that reproduction of lost parts takes place in the 
metabolic as well as in the ametabolic Articulata. 
Note. — Since this paper was delivered to the Royal Society I have repeated these 
experiments on the larvae of Vanessa Id with precisely similar results. The original 
specimens illustrating this paper are now in the cabinets of the British Museum, 
together with others showing the same facts in V. Id. — G. N., Sept. 24, 1844. 
Description of Plate. 
Fig. 1. Head of lulus terrestris with the right antenna reproduced. 
a. The original basal joint. 
h. The reproduced joints. — Magnified. 
Fig. 2. Head of lulus with the left antenna reproduced. 
a. The original basal joint. 
h. The reproduced joints. — Magnified. 
Fig. 3. Head of lulus with a portion of the left antenna reproduced. 
c. The point at which the original antenna was divided, and the reproduc- 
tion of the new parts commenced. — Magnified. 
Fig. 4. Alopus cocophages, Gray, MSS. (natural size), with the right anterior leg re- 
produced. 
a. Coxa. 
h. Femur. 
c. Tibia. 
d. Metatarsus. 
e. Tarsus 
f. Claw. The third tarsal joint in this foot is not developed. 
