. The development of the chick; an introduction to embryology . O !:£! O O oo 73 o> 5: > o —^ r- r- • ^H *—1 -^ o -♦.s sS j:^ -^^ ^^ 2 - eS -* -►^=*;-S ^ - . ^ •^ ^^o w^ r > -tJ *^ ^ fcJC -3 5 s o M • «-H -SdrT • ~ 1—I rH s o r* ~ M *- «^ ^, O — ^-^O -^S - *-H o ^ .• ^ . -»^ _. -H ^i ^ ^ .^ 1—I _;i .> 82 THE DEVELOPMENT OF THE CHICK entoderm for a considerable period after the formation of the head-fold. A longitudinal section shows the head-process as an append-age to the anterior end of the primitive streak, or the primitiveknot (Fig. 42)..

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Keywords: ., bookauthorlilliefrankrattray187, bookcentury1900, bookdecade1910