But I was going to tell you about trenches. When I first began to walk up Manchester Avenue, my thought was, "There's nothing much to grumble at here. I call this pretty good. A little sloppy under foot perhaps, but really nothing to write home about." I've often laughed at that since. For several hundred yards it cuts through a ridge of chalk. It is wide enough to enable one to pass a man in it anywhere with comfort. Its parapet and parados tower white, clean, and unbroken a foot or so over your head. Its sides are like the sides of a house or a tunnel; good, dry, solid chalk, like our Salisbury trenches, with never a sign of caving in about them. And on the hard bottom under foot-perhaps two or three inches of nice clean chalky slime and water. It has a gentle gradient which makes it self-draining. You could easily go right up it to Battalion Headquarters in the support trench in ordinary marching boots, and be none the worse. And since then I've known what it means to get a bootful of muddy water, when wearing trench boots; rubber thigh-boots, you know, with straps buckling to your belt. The change begins a little way above the Battalion Headquarters dug-out, in support line. You leave the chalk behind you and get into clay, and then you leave the clay behind you and get into yellow porridge and treacle. And then you come to a nice restful stretch of a couple of hundred yards or so, in which you pray for more porridge; and it seems you're never coming to any more. This is a vein of glue in the section which "A" will go to-morrow night. "Very old and curious!" "Remarkably fine, full body!" Oh! that glue vein is from the end bin, genuine old-vatted, I can assure you. It must have eaten up some hundreds of pairs of boots by now, and a regular Noah's Ark full of trench stores, ammunition, and other useful material. The glue vein probably had a bottom in bygone days, but now I fancy the Hun has knocked the bottom out of it. In any case, we never met anyone who had found bottom in that bit of line, and as the tallest man in the company is only six foot two, I hope we never shall. At first you think you will skip along quick, like skating fast on very thin ice, and with feet planted far apart, so as to get the support of the trench sides. That bit of trench is possessed of devils, and they laugh when you stretch your legs, meaning to get through with it as quick as you can. The glue's so thick and strong, after the soupy stuff you've been wading through, that you welcome the solid look of it. (That's where the devils begin their chuckling.)