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If we deny it, we contradict the evidence of our senses, for the development is actually accomplished by the transformation of a single cell into a double-walled sac, and of this into different and more intricate organic mechanisms. The process can take place, for it does take place.

The inevitable Carabinero gave us an examination, and then we made our way up from the little port village through beanfields and vineyards and oliveyards, past an old Roman amphitheatre on to the double-walled town.

Birch canoes would be crushed like egg-shells if they were run through the ice jams of spring floods. Certain that their victims were trapped, the Iroquois were in no haste to assault a double-walled fort, where musketry could mow them down as they rushed the hilltop.

Let us now turn back to some of the earlier pages of the embryological record which we passed over in order that we might translate the later portions dealing with more familiar and intelligible structures like gills. Before the egg of the frog becomes an elliptical mass of cells, it is at one time a double-walled sac enclosing a central cavity; in this stage it is called a gastrula.

The double-walled entrance from the hillside, pierced by but a single gate, could only be battered down by heavy artillery, and no guns powerful enough for such a feat could be brought up the hill. The Inner Citadel, access to which was only by a long flight of steps, is unapproachable from any other point, and a handful of defenders could keep an army at bay.

But the barbarity did not close here; for the captain, on seeing the instrument now become useless, ordered another, with which he flogged him as before, beating him at times over the head with the double-walled knot, and changing his hands, and cursing his own left hand for not being able to strike so severe a blow as his right.

Well, I naturally had to admit that a house with double walls is warmer than one with single walls, but, at the same time, one must not lose sight of the fact that the double-walled house is also twice as heavy; and when one has to consider the weight of a pocket-handkerchief, it will be understood that the question of the real advantages of the double-walled house had to be thoroughly considered before taking the step of committing oneself to it.

Like the latter, the human gastrula and that of all other mammals must be regarded as the ontogenetic reproduction of the phylogenetic form that we call the Gastraea, in which the whole body is nothing but a double-walled gastric sac. We already know from embryology the manner in which the gut develops in the embryo of man and the other mammals.

As he sat down and took up the receiver, he put out his hand to stop the door from slowly closing, apparently by itself. It was one of those double-walled, sound-proof, stuffy boxes, and he did not want the door shut tight, so he put out his foot to hold it open. But he was just a moment too late.

"None other. And the double-walled hood is filled with it, too. I suggest that as soon as we have dug a deep hole in the desert the hood and container be buried and forgotten about. I doubt if the engine has many other surprises in store, but I'll be careful as I work on it." "You can fix it? You know what is wrong with it?" Edipon was vibrating with joy.