The digital simulation of a network called mew-Brain is described. The network is a neurochemical version of the existing learning system PURR-PUSS. The organization of computer data for mew-Brain is considered. Several algorithms which have been developed to enable the incorporation of chemical coding in the network are presented. Two sets of results are described. These exemplify the electrical and chemical activity of the network. Some unrelated results are given of a preliminary comparison of ultrasonic imaging devices to determine their suitability in a tactile mobility aid for the blind. Some references encountered during this work are also given.