OF CHLOË 
ON 
(EPHEMERA) DIMIDIA 
TUM. 
487 
E. amine a la 
skin 1s loose, and that A shortly before it b 
ou . within it th ecome 
Ben, soft indeed and E about to disclo may be traced. In th find that the 
within the imperfect, but sti » the butterfl re dites. à 
pupa-skin. M still easil y, you will fi ner, if 
One fund " ore than j y recognizab à find the f 
amental diff one such i able, lyin uture 
in the latter, as fo Moo between an i nner skin, however, i g more or less loosel 
skeleton, in E instance in ourselves eges and a vértehéste is never present y 
s no s , the m animal i j 
are attached to the ski uch skeleton exists uscles are attached t is, that whereas 
ment of insects, so di in. Hence the n ie They have no b o an internal bon 
Moreover the ge Bisnis —( Lab dina nat Van and their spi 
Ei. sult i n n 
The chitine, or iem t is, that without a E and suppleness of horny dermal invest 
of cells lyin ny substance, formi change of skin our own skin . 
g beneath it , forming th s a change of f ERES 
every chan , and, one dnbie etin orm is impossi 
ge of form i e formed, c of an insect i possible. 
 Cm— P! s necessarily accom anne be altered. F is formed by a layer 
, 0 H a . ro FRS 
^ a c Sep nie ni. o ces by scii ie this it follows that 
ae us the n» each change of ski 3 
nut Ber in en. insect is Pr y skin is accompanied b 
last tw m, and the — several ch r less gradual ye 
o moul change ange . ly evol 
Very littl dis ge, instead of bein ges of skin take place is m 
| — g spread without 
of the C e eonsiderati = T over manv, 1 any 
; aterpillar i on will aff y, is confined t 
digestive pilar Is. provi ord us an pus 
or ided wi explanati : 
On th gans are adapted with a pair of st ques of this differe 
ec p for t z rong nee. T 
beaut; ontrary, de his kind of food g Jaws, fitted to eat he mouth 
E adapted t outh of the b - leaves ; and th 
indeed o suck th utterfly i e 
f , only a e necta y 18 suctorial : i 
or the assimilati n embarrassm r from flowers, b al; it has a lon 
parts of the la ation, not of leav T the larva Th zu which would be se pap. 
— COSS aaa es, but:of honey. e digestive or uite useless 
. r of sm gradually m eps Now it 1 : pee also are : 
toner: all chan etamorph ; it is evident adapted 
perish ges, the i phosed into tho that if the 
A the E starvation in en would in the — the perfect insect Ll 
` changes SM y, in the Ortho idst of plenty. ime be unable t ugh 
sect, and e gradual th ptera and, asa wi 0 feed, and 
‘a the principal i mouth of the general rule, among ili : 
to märkable per ee quami a qM of wi es that of the 
isties of in period of death-li ch light on the nat pud denen 
owing to the sect-metamorph “like erm. e ure of the chrysalis o 
EL dit osis. The com ich is one of the m reet 
are th Chrysalis of e changes goi parative quiesce ost striking chara 
pig nili ds iii à mr es ae s : 
ivesti , for inst n 
even if " The cerei organs .._. not only, as has b s 
ey were i ul ones whi rgoing change, b een already menti 
in a conditi TE S diiecid ge, but the same is th ioned, 
ion favourab wings are in e case with th 
le to moti i process of fo r e 
ion, still the ner rmation; and 
vous system, b i 
, by which 
“ Movem 
ents are 
set on fo 
ot and reg 
gulated, is also in a state of such 
such rapid chan 
nge that it 
uld 
i Scarcely act. 
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