Company Names, addresses, dates:
  Purcell & Littlejohn, Leesburg VA

Notes:
H.C. Littlejohn was president of the Virginia Pharmacists Association in 1915¹.

Bottles:

(enlarge)	Clear 2.8" bottle embossed: vertical: PURCELL & LITTLEJOHN LEESBURG VA
(enlarge)	Clear 5" bottle embossed: horizontal: PURCELL & LITTLEJOHN / PHARMACISTS / (P&L monogram) / LEESBURG / VA bottom: WT&CO / AY / USA
(enlarge)	Same as the bottle above, only smaller. It's a clear 4" bottle embossed: horizontal: PURCELL & LITTLEJOHN / PHARMACISTS / (P&L monogram) / LEESBURG / VA bottom: WT&CO / AT / USA

(enlarge)

This is a photo (taken 22-August-2009) of what I beleive was the building that housed Purcell & Littlejohn's Pharmacy. Washington Post articles say the pharmacy was across from the courthouse, and this is indeed one of the buildings across from the courthouse. I further narrowed it down to this building by looking at an old photo hanging in the Loudon County Museum in downtown Leesburg.