Abstract Nelson (I & A Tests, 1:4-9) explained the importance of the role of statistics in Insecticide and Acaricide Tests. Since then, statistical analysis of data included in the reports has become the rule rather than the exception. C. W. Averre’s (I & A Tests, 2:7-10) contribution of a program for a two-way analysis of variance on a Texas Instrument SR52 calculator was instrumental in this increase. Since his publication, the SR52 has been replaced by the Tl programmable 59. The TI59 is similar to the SR52 in that programs can e stored on magnetic cards. However, the TI59 has the capacity to program up to 960 steps (compared with the SR52’S 223) and solid state software library modules are available that can be inserted in the back of the calculator. The TI59 lists for $237.50 but is available from many sources for under $200. The modules list for $40. the same printer used with the SR52 may be used with the TI59.