This section is from the book "The Science And Art Of Phrase-Making", by David Wolfe Brown. Also available from Amazon: The science and art of phrase-making.
147. The prefix con or com, usually expressed in separately-written words by the dot, and in phrases by proximity,* may sometimes be omitted in a phrase, and the remainder of the word joined to the preceding word. Illustrations: some (con)sideration
; in any (con)dition
*See Paragraphs 328-336.
But no word beginning with con or com should be thus joined except those familiar outlines from which, when standing alone, the con dot is habitually omitted. For instance, as the con dot would scarcely be omitted from the word confession if it stood alone, the phrase by his own confession is better written
148. In the following phrases, con or com is to be omitted, and the remainder of the word joined to the preceding word:
every (con)sideration extra (com)pensation in any (con)dition in (con)sequence in my (con)versation into (con)sideration it is (con)venient on (the) (con)trary (on downward)
some (con)sideration some (con)versation such (con)sideration they may (con)sider upon no (con)sideration very (con)siderable will be (con)sidered you will (con)sider
 
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