Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . na, and washedaway from the membrane ofthe yolk (figs. 323 and 324.)The germinal area (area pel-lucida s. germinativa) hasnow an elongated, often a Fig. or yolk after somewhat pyriform appear-from twelve to fourteen hours incuba- ance (figs. 323 and 325, 6),tion, of the natural size (this and the and is two lines in length,other figures of the vitellus look larger rpjie darker vascular areathan proper, from their having been
Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . na, and washedaway from the membrane ofthe yolk (figs. 323 and 324.)The germinal area (area pel-lucida s. germinativa) hasnow an elongated, often a Fig. or yolk after somewhat pyriform appear-from twelve to fourteen hours incuba- ance (figs. 323 and 325, 6),tion, of the natural size (this and the and is two lines in length,other figures of the vitellus look larger rpjie darker vascular areathan proper, from their having been ,fi 323 and 325 ^ hagplaced in flat saucers to be drawn, by \ ° , , , \ ,, which they became somewhat flat- also lengthened out, and thetened) : a, the yolk ; 6, area pellucida, germinal membrane extendsin the middle of which the notaprima- as a foliaceous formationtiva, or primary streak, the first trace of indefinitely over it into thethe embryo is perceived; c, outer area hal which now begin pellucida. the future area vasculosa. , , P The halones are indicated by the three to lookless regularthantheyconcentric circles. were originally. This outer.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
