52 J. W. SLATER, KSQ., F.C.S., F.K.R., Oti 



exists ; but we can measure it relatively by those forces to which 

 we have already alluded. 



For, notwithstanding the difficulties which beset and attend 

 such an investigation, we start with the knowled,o-e that a given 

 quantity of poison force contained in its alkaloid will — if adminis- 

 tered or injected into the body — neutralise, i.e., bring about, 

 sta-^is of its vital force ; or in other words, cause the death of 

 such an organic body; and further, that the force employed to 

 produce such a result must equal the vital force existent in that 

 body or stasis would not follow. So that we may say in respect 

 of this, that as nine-tenths of a drop of anhydrous prussic acid 

 will cause the death of an aveiage man, it necessarily follows that 

 the vital force of the man must be represented by the value of 

 the neutralising force of the nine-tenths' drop of the prussic 

 acid. 



This comparison of opposing force Avith life force may be 

 extended so as to include the reptilian, insectivorous, and other 

 poisons. 



Possibly a more correct standard of the value of vital force 

 will be found, in electricity ; to which, under certain conditions, as 

 a means of extinguishing life in the criminal, the attention of the 

 civilised world, has been of late directed ; and the intensity and 

 quantity of electricity necessary to accomplish this, has been 

 sought for, so as to ascertain the exact measure of electricit}'- 

 necessary to neutralise it. 



By a less certain method of average as to duration of life force 

 in individuals, does the actuary attempt to find its value. 



With reference to the question of effectual resistance of vital 

 force to opposing forces such as we have dealt with, which are 

 cited by the author, and of which we are cognisant, their very 

 existence only proves the truth of the old adage that " there is no 

 rule without an exception." 



To attempt to show in the present state of our knowledge the 

 why and wherefore of these exceptions would be futile. 



Why, for instance, parsley kills parrots — goats can browse upon 

 hemlock, enjoy it and suffer not. 



Why — as cited — the tsetse fly kills some animals and is 

 harmless in respect of others. 



Why eggs and mutton produce symptoms in some persons 

 analogous to poison, etc., etc. 



