very important question-negative batery row

Hello all,
Is it possible an electronic circuit without connecting the negative batery row?
Please see, for example, the circuits with leds at the following webpage:
ourworld.compuserve.com/homepages/Bill_Bowden

Thanks

I'm new here and I am curious about your question. I looked at the circuits although I'm not a technician. What do you mean by 'negative battery row'. Is that the terminal?

Yes. Now I know what it is is the earth connection.