A little while back as I was reading 1 John in Greek. Along with my reading, I was using Charles Lee Irons’ A Syntax Guide For Readers Of The Greek New Testament, which pointed me to pages 145-146 of C.F.D. Moule’s An Idiom-Book of New Testament Greek, which pointed me R.H. Kennett’s In Our Tongues (1907), Chapter 1.
It took me forever and the only place I found it was here. So, if you are ever looking for In Our Tongues, there you go.