484 Mr. BrackwaALL on the 
from the slough, it remains for a short period in a state of great 
exhaustion, suspended solely by a thread from the spinners 
connected with the interior of the abdominal portion of the cast 
skin, which is much corrugated and drawn together. The entire 
process, as above described, occupies the space of about twenty 
minutes. After reposing a little, the spider further attaches 
itself to the suspensory lines by the claws of the feet; and when 
its strength is sufficiently restored, and its limbs have acquired 
the requisite degree of firmness, it ascends its filaments and 
seeks its retreat. | 
Having frequently witnessed the moulting of spiders in their 
natural haunts, and also in a state of captivity, and having care- 
fully examined the cast skins of numerous species belonging to 
the genera Epeira, Theridion, Aranea, Clubiona, Drassus, Salticus, 
&c., in the precise situations and under the same circumstances, 
apparently, in which they have been left by their former occu- 
piers, | am thoroughly persuaded that the process is a very 
uniform one. 
Intimately connected with the renovation of the integuments 
is the reproduction of the limbs of spiders. For this interesting 
discovery we are indebted to the late Dr. C. Heineken, whose 
investigations relative to the subject are published in the Zoolo- 
gical Journal, vol.iv. p. 284 & 422 ; and I am happy to bear tes- 
timony to the general accuracy of his conclusions. 
The reproduction of the palpi does not appear to have been 
noticed by Dr. Heineken; but that these members, after suffer- 
ing mutilation, are restored in the same manner as the legs, I 
have clearly proved by repeated experiments. That mutilated 
members are not always reproduced at a subsequent moulting, 
even when it takes place at a period considerably after the 
infliction of the injury, is rendered evident by the following 
remarkable fact. On the 13th of July, 1830, a male specimen 
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