1. Wherever Captain Carter has used Martian measurements of time, distance, weight, and the like I have translated them into as nearly their equivalent in earthly values as is possible. His notes contain many Martian tables, and a great volume of scientific data, but since the International Astronomic Society is at present engaged in classifying, investigating, and verifying this vast fund of remarkable and valuable information, I have felt that it will add nothing to the interest of Captain Carter’s story or to the sum total of human knowledge to maintain a strict adherence to the original manuscript in these matters, while it might readily confuse the reader and detract from the interest of the history. For those who may be interested, however, I will explain that the Martian day is a trifle over 24 hours 37 minutes duration (Earth time). This the Martians divide into ten equal parts, commencing the day at about 6 a.m. Earth time. The zodes are divided into fifty shorter periods, each of which in turn is composed of 200 brief periods of time, about equivalent to the earthly second. The Barsoomian Table of Time as here given is but a part of the full table appearing in Captain Carter’s notes.

    200 tals 1 xat
    50 xats 1 zode
    10 zodes 1 revolution of Mars upon its axis.