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We live in the begi•ttivg of the cement age; no, I will say that we are living in the cement age. They are building almost every kind of plant tha•: can be built with wood, iron, stone or steel and using cement to do. it. Today we see stately buildings, immense bridges, /,'rear elevators--all constructed of cement. But the pnrpo.se of this paper is to show wha4 can be done with cement by the fish e•tltnrJst. Various materials have been used, wood, perhaps to a greater extent than any other, tin, sheet iron and various compositions but: none that gave entire satisfaction; sheet iron and tin fo.r the reason of its elastieitv not being stiff enough; wood for the reason that it was short lived and consequently expensve.Avear ago, as superintendent of fisheries for the state of Mhmesota, I was confronted with a problem of replacing all the wooden buildings and troughs including our pike-perch battery at our St. Paul station. We bad been patching until it was hard to tell where the original left off and the patchwork began. ha([ constructed some cement ponds four years ago and found they grave good satisfaction, stan(lin• the winters and summers, and consequently the contraction and expansion that wonhl come with the head and cold. f laid m:y plan before the board and g'ot their approval to build a cement house 32x64, everything but the roof, do.ors and windows to be cement.The place selected was a veritable swamp, twelve feet of muck and peat filled with springs. We made up our minds if a building could be eonstrnefed of cement on land of this description Jt would be a pretty good test of what could be clone with conditions more favorable. We first laid 4x10 plank side by side lengthwise of the foundation wails, placing •ix inch cedar po•ts four feet long crosswise every four feet apart. We then walled up the s/des and placed our concrete mixture, eo.nsisting o.f two parts of broken stone, three parts of clean, sharp sand and one part of Atlas Portland cement. This part of the wall American Fdsheries Society 133 wc built two feet high so that we had fo,r a starter a foundation of ?x4 of concrete floating' on this peat bog'; then we joggeJ the wall six inches on eacl• side and built• another l•oot. Then the