If you use a typewriter and/or don't have fancy symbols (or cymbals) at your fingertips, you make the ellipse by putting three periods (dots) next to each other: "..." not ". . ." .


Q, Merriam-Webster's online dictionary is more comprehensive in its definition of "ellipsis":

1 a : the omission of one or more words that are obviously understood but that must be supplied to make a construction grammatically complete
1 b : a sudden leap from one topic to another

2 : marks or a mark (as …) indicating an omission (as of words) or a pause

The second meaning is important, as the ellipse often indicates that portions of the text have been omitted, not because they are "obviously understood," but because they are unnecessary or irrelevant to the point or purpose of the quotation.   

This is where misinterpreting the "..." as a mere pause in the thought can be extremely misleading. If readers don't recognize that portions of the report or argument have been skipped over, they may erroneously think that they've read the whole report or argument (or poem) and all the information they need to judge its value or validity.