292 
MR. NEWPORT ON THE REPRODUCTION OF LOST PARTS 
thus coinciding precisely with what I have already stated in regard to the irregular 
development of the armature of reproduced limbs in the Myriapoda. 
The remaining five specimens were developed between the 18th and 20th of June, 
the last individual having made its appearance at an early hour of the morning of 
the present day (June 20), having remained eleven days and four hours in the pupa 
state, which condition it entered at a temperature of 71° Fahr., and left when it was 
only 63 ° Fahr. In two of these instances also there was only an abortive attempt at 
reproduction ; the limb was microscopic in size, and imperfect (fig. 15 to 16.), but in 
the other three the reproduction was very complete. 
It is a matter of great interest to ascertain to what the non-production of the legs 
in some of these instances is to be attributed, while a complete reproduction took 
place in others. Thus, in the last developed specimen the second leg on the left side 
was reproduced, but the third one was not. This fact appears at first to support the 
opinion that the reproduction of lost parts depends on the existence of special struc- 
tures, situated in some portion of the base of the limb, the removal of which prevents 
the redevelopment of the lost part. But this conclusion is opposed by the fact, that 
even in those instances, in these experiments, in which the entire limb, with the 
coxa or basilar joint was removed, a new limb was afterwards produced, or the 
merest possible rudiment of a limb was developed, while in others there was no in- 
dication of it whatever. 
When an entire limb is reproduced it is always composed of its essential parts 
(fig. 4.), — coxa, femur, tibia, tarsus and claw. Besides being inferior in size, the 
tarsus is often deficient in the number of its joints ; and the subsidiary parts of the 
limb, the articular spines, are almost always absent. This is more especially the case 
when a limb has been divided in the femoral or tibial joints, and the reproduction of 
the limb has, in consequence, been only partial. But in all of these cases the terminal 
part of the organ, the claw, is invariably reproduced. This was strikingly shown in 
some specimens of partial reproduction, in which the claw was formed at the ex 
tremity of a metatarsal joint, or when one or more of the tarsal joints were wanting. 
It is thus sufficiently clear that a power of reproduction of lost parts is common to 
the whole of the Insecta and Myriapoda ; and that it may take place in insects that 
undergo a complete metamorphosis, as well as in those which do not change their form. 
It yet remains to be shown in what way this regeneration of parts takes place. The 
fact that it commences in insects and Myriapoda in any portion of an organ that may 
be wounded, or that it may occur, as in Spirostreptus and other lulidce, where the 
entire organ with its basal portion has been removed, seems to lead to the inference 
that it is not confined to special parts, but exists equally in the whole of the organized 
tissues. 
The general conclusions to which I have been led by these investigations are, — 
First, that slight wounds of the body in larva are always healed, except when there 
is any protrusion of the viscera, or, as in the higher Vertebrata, when heemorrhage 
