Additional Analog input via an external source

Projects General Guidance
1

Current setup: Arduino Uno w/ Ethernet Sheild.
6 glass Thermistors attached to A0 thru A5. http://www.mouser.com/Search/ProductDetail.aspx?R=NTCLG100E2103JTvirtualkey59420000virtualkey594-NTCLG100E2103JT

By way of code, I can read the 0-5v voltage readings on the glass Thermistors. Problem that is evolving is that I am going to expand and need more Thermistors. So By way of an Analog to Digital Converter I can expand to a large amount.

My question is how can I go about reading the said chip above on the arduino?

2

eqrunner:
My question is how can I go about reading the said chip above on the arduino?

Interface Type: Serial, SPI

3

You might consider using a multiplex board like below.

4

Or roll your own, this project shows how to use an analogue multiplexer to expand the number of analogue inputs.
http://www.thebox.myzen.co.uk/Hardware/MIDI_Footsteps.html