This clip explains the different types of gases used and their effects. He gives a harrowing description of one soldier who was badly burned by gas.   This clip is one of fourteen clips in which actor John Gregor recreates a Great War soldier called Henry Fairhurst of the Barnsley Pals. In this clip he talks about poison gas. In all of these clips of Henry Fairhurst it is important to be aware that the actor is reconstructing a character from the past. He is using original source material and other research to create what he thinks is a plausible reconstruction of the thoughts and views of a private in the Barnsley Pals. When watching each clip it is important that viewers consider whether they feel the information given is accurate, but much more importantly whether they feel the tone and emphasis the actor gives to particular issues is in line with their own reading of the evidence from the time.