Through the process of elimination and geography, I'd guess the 2nd photo is Arthur Valentine. Lightweight from Lambeth, London, England.
http://boxrec.com/list_bouts.php?hum...4965&cat=boxer
Two other possibilities include:
Ike Valentine:
http://boxrec.com/list_bouts.php?hum...0533&cat=boxer
or Fred Valentine:
http://boxrec.com/list_bouts.php?hum...6896&cat=boxer