There are many considerations which must be attended to in extending the sequences to be used, such as uniqueness in the meaning of the words formed, ease of pronunciation, avoidance of awkward combinations. I drop “s” altogether from the consonant series and short “u” from the vowel series. It is convenient to have unsignificant letters at disposal. A double consonant like “st” for instance can be referred to without giving it a local significance by calling it “ust.” I increase the number of vowels by considering a sound like “ra” to be a vowel, using, that is, the letter “r” as forming a compound vowel. The series is as follows:— CONSONANTS. 0 1 2 3 4 5 6 7 8 9 positive n t l p f sh k ch nt st negative z d th b v m g j nd sp VOWELS. 0 1 2 3 4 5 6 7 8 9 positive e a i ee ae ai ar ra ri ree negative er o oo io oe iu or ro roo rio _Pronunciation._—e as in men; a as in man; i as in in; ee as in between; ae as ay in may; ai as i in mine; ar as in art; er as ear in earth; o as in on; oo as oo in soon; io as in clarion; oe as oa in oat; iu pronounced like yew. To name a point such as (23, 41) it is considered as (3, 1) on from (20, 40) and is called “ifeete.” It is the initial point of the square ifeet of the area system. The preceding amplification of a space language has been introduced merely for the sake of completeness. As has already been said nine words and their combinations, applied to a few simple models suffice for the purposes of our present enquiry. _Printed by Hazell, Watson & Viney, Ld., London and Aylesbury._