In order to understand the integration of the laboratory into practice at an elite London hospital, this chapter analyses the language used within the case notes and presents two biographical studies of physicians at Bart's. The purpose is to understand why some published representations of physicians' attitudes towards the laboratory and its specialists differ from their practice between 1880 and 1920. Although the chapter mainly focuses on Bart's, comparisons are made with the Addenbrooke's case notes, utilizing the same dataset as Chapter 1. First, the transition in the use of the word ‘natural’ to the word ‘normal’ within the case notes is analysed. This shift illustrates how patterns in language associated with laboratory science and quantification complicate the story of physicians' reception of bacteriology. Second, the chapter re-examines and revises the representations and self-representations of physicians from two generations at Bart's who have already been discussed in detail by historians. The first is Samuel Gee, physician at Bart's from 1868 to around the turn of the century.