. The development of the chick; an introduction to embryology . •— ^ C ■- . 03^13 ^ a> =33 « M tC —> > -! 2 3 >5.^^ r. ?-1 p _« c; . .S X c-?*^^pli ■- c £: i- o w„- ^^ r _n ■^ w c J; J -M ~ ri ■;3 c. c^.:: M J O X O 5 .^^o 2 o cc s t; t. TT s ^ *— „^ .~ T ;^ -^ c^ c -^ S n - — O .^ ^ , ; *■— v: ^ E t: c a. Q K -J f- r ^ i„ t^ X 2 -3 1 ~ -j- 1^ X ^ 4^ ^ C - t; ;:; ;^ j: !- ~.c ? ■ a. ^ •-^ 5 — Ii = p ^ *<- s o o i<rt-B^ u i: b£ - c 88 THE DEVELOPMFAT OF THE CHICK is a layer of the niesoderin (Fi^. 41). If the blood-islands bereekotuMl as niesoderin we must distinguish two laye

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. The development of the chick; an introduction to embryology . •— ^ C ■- . 03^13 ^ a> =33 « M tC —> > -! 2 3 >5.^^ r. ?-1 p _« c; . .S X c-?*^^pli ■- c £: i- o w„- ^^ r _n ■^ w c J; J -M ~ ri ■;3 c. c^.:: M J O X O 5 .^^o 2 o cc s t; t. TT s ^ *— „^ .~ T ;^ -^ c^ c -^ S n - — O .^ ^ , ; *■— v: ^ E t: c a. Q K -J f- r ^ i„ t^ X 2 -3 1 ~ -j- 1^ X ^ 4^ ^ C - t; ;:; ;^ j: !- ~.c ? ■ a. ^ •-^ 5 — Ii = p ^ *<- s o o i<rt-B^ u i: b£ - c 88 THE DEVELOPMFAT OF THE CHICK is a layer of the niesoderin (Fi^. 41). If the blood-islands bereekotuMl as niesoderin we must distinguish two layers of thelattei-, a deep or vascular layer (angioblast) lying next thegerm-wall, and an upper layer next the ectoderm, which maybe called the ccclomic mesoderm, inasmuch as the bod^-cavity(cnelome) de

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