problem with starting date of successive tasks

Hi,

(MrProject Ver: 0.9.1 on Redhat Linux 8.0)

I have the following set of tasks:

Name       Start      Finish      Work

t1         Jun 19     Jun 30      8d
t2         Jun 30     Jul 23      17d
t3         Jul 23     Sep 17      40d
t4         Sep 17     Nov 26      50d

etc..,

I want to get the starting date of "n"th task to be finishing date of
"n-1"th task + one.  In my case whatever I do, I am always getting the
starting date of "n"th task as finishing date of "n-1"th task.

-- mks --