292 The Scottish Naturalist. 



suspicion attaches must be set aside as valueless in a scientific 

 sense ; for it is incumbent on the student of Comparative 

 Psychology to make use of no doubtful or doubted facts — to 

 resort to no dubious sources of information. Hence it is that 

 I cannot, and do not, myself quote from such a work as the 

 " Globe Encyclopaedia." 



Parenthetically it may be here stated that there is no neces- 

 sity for recourse to doubtful sources of information anent 

 Animal Intelligence. Illustrative anecdotes of a perfectly 

 authentic kind are superabundant, if carefully looked for. But 

 even these the student would do well to set aside — except as 

 affording secondary or confirmatory evidence — in favour of 

 original observation,ai\<X personal reflection on the Facts observed; 

 and there is scarcely a man, woman, or child so unhappily cir- 

 cumstanced as not to have ample opportunity, on all hands, for 

 original first-hand or direct observation of the character and 

 habits of certain animals. 



Besides encyclopaedias proper, there are many works treating 

 exclusively, in a popular way, of animals and their habits, or 

 containing articles of this character, that are virtually encyclo- 

 paedic, and that may, therefore, fitly be reviewed in connection 

 with the larger works. Such, for instance, are 



(1) The Popular Natural Histories of Cassell and other 



publishers. 



(2) The Percy Anecdotes. 



(3) The Treasuries of Maunder and others. 



(4) The " Information for the People," and " Miscellany of 



Useful and Entertaining Tracts," of Messrs Chambers. 



(5) The Natural Histories for the Young, published by 



(a) The Religious Tract Society, and the Book Society, 

 both of London. 



(b) The Messrs Nelson, of Edinburgh. 



(c) Messrs Seeley, Jackson, and Halliday, of London. 



(d) Messrs George Routledge & Sons, London. 



(e) Messrs Macmillan & Co., London and Cambridge. 



(f) Messrs Chapman & Hall, London. 



(g) " Our Dumb Companion Series ' ; (illustrated) of 



Messrs S. W. Partridge & Co., London. 



In regard to the " Popular Natural History " of Messrs 

 Cassell, Petter, & Galpin, London, a handsome work in various 



