ANOTHER WORLD DOW^ HERE. 13 



beyond the "central hemispheres goes on extending more and 

 more, and the relative magnitude of the terminal ganglia or 

 olfactory lobes increases in similar order. 



We have only to omit the nasal bones and nostrils, to con- 

 tinue this forward extrusion of the olfactory nerves and their 

 bulbs and branches, to coat them with suitable sheaths provided 

 with muscles for mobility, and we have the antenna of insects. 

 I submit this view of the comparative anatomy of these organs 

 as my own speculation, to be taken for what it is worth. 



There is no doubt that the antennae of these creatures are 

 connected by nerve-stalks with the anterior part of their 

 supra-iesophageal ganglia i.e. the nervous centres correspond- 

 ing to our brain. 



But what kind and degree of power must such olfactory 

 organs possess 1 The dog has, relatively to the rest of his 

 brain, a much greater development of the olfactory nerves and 

 ganglia than man has. His powers of smell are so much 



greater than ours that we find it difficult to conceive the possi- 

 ility of what we actually see him do. As an example I may 

 describe an experiment I made upon a bloodhound of the 

 famous Cuban breed. He belonged to a friend whose house is 

 situated on an eminence commanding an extensive view. I 

 started from the garden and wandered about a mile away, 

 crossed several fields by sinuous courses, climbing over stiles, 

 and jumping ditches, always keeping the house in view ; I 

 then returned by quite a different track. The bloodhound was 

 set upon the beginning of my track. I watched him from 

 a window galloping rapidly, and following all its windings 

 without the least halting or hesitation. It was as clear to his 

 nose as a gravelled path or a luminous streak would be to our 

 eyes. On his return I went down to him, and without 

 approaching nearer than five or six yards he recognized me as 

 the object of his search, proving this by circling round me, 

 baying deeply and savagely though harmlessly, as he always 

 kept at about the same distance.* 



* "What did he smell ? Was it an emanation from the soles of my 

 feet? If so, how did this aura get through the soles of my boots, 

 which were thick ? It could scarcely have been the odor of the boot 

 soles themselves that he followed, as he recognized me afterward at 

 some distance. This suggests an interesting experiment, that any- 

 body owning one of these dogs may easily try. Make a similar track 

 to mine, but when on the way, take off the boots you wore on start- 

 ing and change them for some one else's boots, or a new pair, and 

 watch the result from the window. 



