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A method of fabricating an elastomeric structure, comprising: forming a first elastomeric layer on top of a first micromachined mold, the first micromachined mold having a first raised protrusion which forms a first recess extending along a bottom surface of the first elastomeric layer; forming a se

A method of fabricating an elastomeric structure, comprising: forming a first elastomeric layer on top of a first micromachined mold, the first micromachined mold having a first raised protrusion which forms a first recess extending along a bottom surface of the first elastomeric layer; forming a second elastomeric layer on top of a second micromachined mold, the second micromachined mold having a second raised protrusion which forms a second recess extending along a bottom surface of the second elastomeric layer; bonding the bottom surface of the second elastomeric layer onto a top surface of the first elastomeric layer such that a control channel forms in the second recess between the first and second elastomeric layers; and positioning the first elastomeric layer on top of a planar substrate such that a flow channel forms in the first recess between the first elastomeric layer and the planar substrate.

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1. A method of microfabricating an elastomeric structure, comprising:microfabricating a first elastomeric layer with microfabricated recesses having a width less than 1000 μm therein;positioning a second elastomeric layer with microfabricated recesses having a width less than 1000 μm the

1. A method of microfabricating an elastomeric structure, comprising:microfabricating a first elastomeric layer with microfabricated recesses having a width less than 1000 μm therein;positioning a second elastomeric layer with microfabricated recesses having a width less than 1000 μm therein; on top of the first elastomeric layer, andbonding a bottom surface of the second elastomeric layer onto a top surface of the first elastomeric layer to form a monolithic elastomeric block, a portion of the monolithic elastomeric block being deflectable into one of the recesses when the portion is actuated to form a valve. 2. The method of claim 1 wherein the first and second elastomeric layers are microfabricated by replication molding. 3. The method of claim 1 further comprising recesses being formed within said monolithic elastomeric block, wherein the recesses are microfabricated by sacrificial layer methods. 4. The method of claim 1 wherein the first and second elastomeric layers are microfabricated by injection molding. 5. The method of claim 1 wherein:the first elastomeric layer is fabricated on a first micromachined mold having at least one raised protrusion which forms at least one recess in the bottom of the first elastomeric layer; andthe second elastomeric layer is fabricated on a second micromachined mold having at least one raised protrusion which during microfabrication forms at least one recess in the bottom of the second elastomeric layer upon removal of the protrusion from the second elastomeric layer. 6. The method of claim 1 further comprising:sequential addition of further elastomeric layers, whereby each layer is added by:microfabricating a successive elastomeric layer, andbonding the bottom surface of the successive elastomeric layer onto a top surface of the monolithic elastomeric block. 7. The method of claim 1 wherein the first elastomeric layer has an excess of a first chemical species and the second elastomeric layer has an excess of a second chemical species. 8. The method of claim 7 wherein the elastomeric layers comprise thermoset elastomers which are bonded together by heating above an elastic/plastic transition temperature of at least one of the first and second elastomeric layers. 9. The method of claim 7 wherein the first chemical species forms bonds with the second chemical species when at least one chemical species is activated. 10. The method of claim 7 wherein the first and second elastomeric layers are composed of the same component materials, but differ in the ratio in which the component materials are mixed together. 11. The method of claim 1 wherein the first and second layers are bonded by a layer of adhesive consoled of the same component materials as the elastomeric layers. 12. The method of claim 1 wherein at least one of the elastomeric layers having a conductive region therein. 13. A method of microfabricating an elastomeric structure, comprising:forming a first elastomeric layer on a substrate the first elastomeric layer having a recess therein;curing the first elastomeric layer;patterning a first sacrificial layer over the first elastomeric layer;forming a second elastomeric layer over the first elastomeric layer, thereby encapsulating the first patterned sacrificial layer between the first and second elastomeric layers;curing the second elastomeric layer to form a monolithic elastomeric block from the first and second elastomeric layers; andremoving the first patterned sacrificial layer between the first elastomeric layer and the second elastomeric layer, thereby forming at least one first recess between the first and second elastomeric layers to form a monolithic elastomeric block, a portion of the monolithic elastomeric block being deflectable into one of the recesses when the portion is actuated to form a valve, wherein the first and second elastomeric layers have microfabricated recesses having a width less than 1000 μm therein. 14. The method of claim 13 further co mprising patterning a second sacrificial layer over the substrate prior to forming the first elastomeric layer, such that the second patterned sacrificial layer is removed during removal of the first patterned sacrificial layer to form at least one recess along a bottom of the first elastomeric layer. 15. The method of claim 13 further comprising:patterning a second sacrificial layer over the second elastomeric layer;forming a third elastomeric layer over the second elastomeric layer, thereby encapsulating the second patterned sacrificial layer between the second and third elastomeric layer;curing the third elastomeric layer; and,removing the second patterned sacrificial layer to form a recess between the second and third elastomeric layers. 16. The method of claim 13 further comprising:patterning an (n−1)th sacrificial layer over the nth elastomer layer wherein n ranges from 3 to 7;forming a (n+1 )th elastomeric layer over the (n−1)th patterned sacrificial layer;bonding the bottom surface of the (n+1)th elastomeric layer onto a top surface of the nth elastomeric layer thereby encapsulating the (n−1) patterned sacrificial layer between the nth and (n+1) elastomeric layers;curing the (n+1) elastomeric layer; and,removing the (n−1) patterned sacrificial layer to form a recess between the nth and (n+1) elastomeric layers. 17. The method of claim 13 wherein the first patterned sacrificial layer comprises photoresist. 18. The method of claim 14 wherein the monolithic elastomeric block is formed by interpenetration and reaction of the polymer chains of the uncured elastomer with the polymer chains of the cured elastomer. 19. The method of claim 14 wherein the first elastomeric layer has an excess of a first chemical species and the second elastomeric layer has an excess of a second chemical species. 20. The method of claim 19 wherein the first chemical species forms bonds with the second chemical species when at least one chemical species is activated.