Disclosed is a novel apparatus and method for volumetric dilatometry. In a communication method, a transmitter groups packets to be transmitted to the receivers according to transmission rates, and generates frames configured by packets with an identical transmission rate. Methods for producing a maize plant that comprises crossing maize variety 32D78 with another maize plant. The cover member may be constructed of material that is capable of withstanding higher temperatures and forces compared to the material of the guide blocks.