1897.] Psychology. 89 
“On removing the glasses on the third day, there was no peculiar 
experience. Normal vision was restored instantaneously and without 
any disturbance in the natural appearance or position of objects.” 
As the author remarks, the experiment did not cover enough time 
to determine the full power of experience. But the main point at 
issue—the two opposing views of subjective space already alluded to— 
seems to have been fairly well settled. There was shown to be a pos- 
sibility of co-ordinating our tactile space with an artificially inverted“ 
visual space ; the localization of the hand (e. g.) by feeling was gradually 
assimilated to its position in the new visual field, ete. There was not, of 
course, time to overcome completely the experience of ages in one direc- 
tion. But that it was overcome at all, and that the new experience 
was to a large degree reconcilable with the tactile data, shows clearly, 
I think, that the original co-ordination is quite independent of any 
mental projection or cerebral re-inversion. The two space-schemes 
arise separatively ; that they correspond, point for point, as they do, is 
owing simply to repeated and uncontradicted experience. 
It is to be hoped that the author will be able to repeat the experi- 
ment again and observe the effect of a longer continuation of the experi- 
ence. He might be able eventually to get rid of the persistent inver- 
sion of the head and shoulders, perhaps, by looking at himself fre- 
quently in a mirror. If a single pair of lenses could be devised to 
cover both eyes, the difficulties arising from imperfect convergence 
might be overcome, and the experiment extended to binocular vision. 
Howard C. WARREN. 
Birds’ nests and instinct.—Some very interesting observations 
on the nesting habits of birds recorded by Dr. R. Williams in the Oct- 
ober (1896) number of the Zoologist are worthy of note, the more so 
since they bear upon the subject of instinct and the power of learning 
from experience that has lately been occupying the attention of cer- 
tain psychologists. It must be regretted that Dr. Williams’ observa- 
tions seem to be hap-hazard and, therefore, lacking the detail that would 
make them conclusive. In this respect he is not different from the host 
of oological observers that claim the title of scientists. Take for in- 
stance his note regarding cuckoos hunting their nests. He says “my 
son informed me one day that he knew where a cuckoo was going to 
lay. He said he had seen a cuckoo fly out of a hedge, which on ex- 
amination he found to contain a hedge-sparrow’s nest ready for eggs. 
The boy’s expectation was realized. He visited the nest repeatedly, 
and one day announced that the Hedge-sparrow had begun to lay. 
Three days later he brought me the contents of the nest, consisting of 
