Two black wire and no white wire
One very basic thing to wrap your head around is that the loads in power circuits are all in parallel;  circuits are generally completed through loads such as say a light bulb or a cord and plug device like a toaster or a TV or a computer power supply.  On 120V household branch circuits the power goes out on a hot, through a load, and returns on a neutral.  All the lights on your daisy chain are in parallel, not in series.  

If your switch box has just two wires, it's not a hot and a neutral; if you closed a switch with hot on one terminal and neutral on the other, it would make a dead short and the circuit breaker would trip immediately (hopefully!). 
 A regular switch has constant hot on one side of the switch, and a switched hot on the other.  If there's just two wires in the switch box, its a switch loop.  



Given the age of your house don't make any assumptions about the wiring color code.  This is good advice even with modern wiring, you never know what the last person may have done, or done wrong.  But older wiring systems simply didn't color code the way modern systems do.  

If you have to identify a neutral, it can be tricky.  In modern house wiring, switching the neutral is a no-no;  in the old days it was standard practice.  They used to use some complicated circuits for switch wiring.