54 Professor Hal ford. 



attitude of the hyena. If the dose is larger than from 31 to 

 46 grains, the symptoms are not dissimilar, save that they 

 terminate in death, which is generally preceded by 

 convulsions." 



There is a great similarity of symptoms described in 

 the extract to those resulting from my own experiments. 

 But, strange to say, the main difference is, that after 

 injecting 44 J grains, I could not produce any coma, 

 neither were there any death-like symptoms or any- 

 thing approaching thereunto. 



In man, as we all know, no such quantities as stated 

 above can be injected, and we also know that the 

 action of morphia on individuals is different. A small 

 dose in one will produce a sound sleep ; in another, 

 restlessness, and not a wink of sleep all ni^ht. These 

 are the idiosyncrasies which are so multiple in the 

 human race. The higher the mental development, the 

 more varied are the characteristics of the individual. 

 The lower we go down, the more do these individual 

 attributes disappear, till at last there is not much 

 difference between one frog and another, or between 

 one wasp and another. 



But there are good tempered dogs and bad tempered 

 dogs; intelligent dogs and stupid dogs. The fidelity 

 of the dog is proverbial. Now, this fidelity is the 

 result of mental organisation inherited, and of ante- 

 cedent cerebral organisation. 



A few words, therefore, are necessary to explain, if 

 possible, the difference of the action of vegetable 

 poisons, such as morphia and belladonna, on dogs 

 and man. 



(1) There is very little difference between the 

 ganglia at the base of the brain, or their connections 

 with other parts, or with the organs of special sense 



