. "These can be in the form, for example, of perforations 9 through the base lamina 12 or through the cover lamina 14, as illustrated in FIG. 1B. Where, as shown for example in FIG. 1B, the reservoirs or access ports or receptacles are formed in a lamina other than the one in which the channels are formed, they must be located so as to be suitably aligned with appropriate sites in the microchannel st" . . .