Device for the series testing of liquid samples, characterised in that • sample chambers [kp] take up liquid samples to be tested • the sample chambers [kp] are arranged in a binary or t-ary tree order via overflow pipes [lpu] and • the sample chambers [kp] have a possibility of pressure equalization, preferably by a respective pressure equalization line [lda, ldb, ld...] to the associated logically subordinate sample chamber [kn], ie [kpa, kpb, kp...], • the logically superior sample chambers [kv] are physically lower than those supplying the volume to be mixed [kn], • each sample chamber contains at least the following parts: top t Inputs [lpa, lpb, lp...] from logically subordinate, hydrostatically higher sample chambers, opening down into a sample chamber neck [kh], and from [kh] opening down into a sample retention chamber [kr], • further each sample chamber between sample chamber neck [kh] and sample retention chamber [kr] contains an opening [lpue] to an outgoing overflow line [lpu] and from [lpu] to an outgoing line [lp], where each of the t overflow lines [lpu, lp] of a sample chamber [kp] leads from one of t logically subordinate, so hydrostatically higher sample chambers [kn] in the input [lpa, lpb, lp...] of her logically higher-level, hydrostatically lower sample chamber, • samples receiving sample chambers are arranged in a binary or t-ary tree order, wherein each sample chamber [kp] picks up a sample that may be a single sample, e.g. from a sample tube, or a test-neutral dummy sample or a mixed sample of t logically directly subordinate nodes or a mixed sample of t logically directly subordinate root nodes of cascading devices, • each sample or chamber [kp] logically represents a tree node and • the t in "t-är", ie the number of logically directly subordinate nodes per inner node is fix or else variable over the tree height, • every single sample [pe] logically represents a leaf node [kb] and corresponds to a single-sample chamber, e.g. a sample tube, • each mixed sample [pm] logically represents an inner node [ki] (ie no leaf node) and corresponds to a sample chamber [kp], • the volume of each sample chamber [kp] logically divides into a sample volume [vr] needed for any assay in a sample retention chamber [kr] and a volume [vh] in the sample chamber neck [kh] within [kn] that is at least the t-th part of the volume [vr] of the logically superior sample retention chamber [kr] within [kv]. • sample chambers [kp] take up liquid samples to be tested • the sample chambers [kp] are arranged in a binary or t-ary tree order via overflow pipes [lpu] and • the sample chambers [kp] have a possibility of pressure equalization, preferably by a respective pressure equalization line [lda, ldb, ld...] to the associated logically subordinate sample chamber [kn], ie [kpa, kpb, kp...], • the logically superior sample chambers [kv] are physically lower than those supplying the volume to be mixed [kn], • each sample chamber contains at least the following parts: top t Inputs [lpa, lpb, lp...] from logically subordinate, hydrostatically higher sample chambers, opening down into a sample chamber neck [kh], and from [kh] opening down into a sample retention chamber [kr], • further each sample chamber between sample chamber neck [kh] and sample retention chamber [kr] contains an opening [lpue] to an outgoing overflow line [lpu] and from [lpu] to an outgoing line [lp], where each of the t overflow lines [lpu, lp] of a sample chamber [kp] leads from one of t logically subordinate, so hydrostatically higher sample chambers [kn] in the input [lpa, lpb, lp...] of her logically higher-level, hydrostatically lower sample chamber, • samples receiving sample chambers are arranged in a binary or t-ary tree order, wherein each sample chamber [kp] picks up a sample that may be a single sample, e.g. from a sample tube, or a test-neutral dummy sample or a mixed sample of t logically directly subordinate nodes or a mixed sample of t logically directly subordinate root nodes of cascading devices, • each sample or chamber [kp] logically represents a tree node and • the t in "t-är", ie the number of logically directly subordinate nodes per inner node is fix or else variable over the tree height, • every single sample [pe] logically represents a leaf node [kb] and corresponds to a single-sample chamber, e.g. a sample tube, • each mixed sample [pm] logically represents an inner node [ki] (ie no leaf node) and corresponds to a sample chamber [kp], • the volume of each sample chamber [kp] logically divides into a sample volume [vr] needed for any assay in a sample retention chamber [kr] and a volume [vh] in the sample chamber neck [kh] within [kn] that is at least the t-th part of the volume [vr] of the logically superior sample retention chamber [kr] within [kv].