The Expression of the Emotions in Man and Animals "core" expressions: anger, fear, surprise, disgust, happiness and sadness. Darwin received dozens of photographs of psychiatric patients from James Crichton-Browne, but included in the book only one engraving (photoengraved by James Davis Cooper) based on these illustrations – sent on 6 June 1870 (along with Darwin's copy of Duchenne's "Mécanisme") ("Darwin Correspondence Project": Letter 7220). This was "Figure 19", page 296 – and showed a patient (Crichton-Browne reported) under the care of Dr James Gilchrist at the Southern Counties Asylum (of Scotland), the public wing of the Crichton Royal in Dumfries. The review in the January 1873 "Quarterly Journal of
Emotion in animals could be used to include all the animal kingdom as well as some plants. The second approach, mechanistic, requires an examination of the mechanisms that drive emotions and search for similarities in animals. The mechanistic approach is utilized extensively by Paul, Harding and Mendl. Recognizing the difficulty in studying emotion in non-verbal animals, Paul et al. demonstrate possible ways to better examine this. Observing the mechanisms that function in human emotion expression, Paul et al. suggest that concentration on similar mechanisms in animals can provide clear insights into the animal experience. They noted that in humans, cognitive biases vary according