160 Zoology of the International Exhibition. 



be constantly kept ready for use, have, as previously stated, 

 removed one great impediment to the prosecution of micro- 

 scopic photography. The point to which attention should now 

 be directed, is the attainment of some simple method of arti- 

 ficial illumination. The illuminating agents now in common 

 use are all greatly deficient in actinic power ; and though pho- 

 tographs have been taken by their light, they are practically 

 unavailable. It is evidently impossible that this application of 

 photography should become at all general so long as it is 

 entirely dependent on a brilliant sunlight, or on such agents as 

 the electric and oxyhydrogen light, but if some easily produced 

 flame, rich in actinic rays, could be devised, then we might rea- 

 sonably look for a very extensive development of this branch of 

 the art. It could then be practised in all weathers, and at all 

 hours, and there are few objects which could not be represented 

 successfully by its means. 



ZOOLOGY OF THE INTERNATIONAL EXHIBITION. 



Though there are very few contributions to the International 

 Exhibition that directly claim the attention of the zoologist, 

 those that illustrate the great subject of economic zoology are 

 literally numberless, and to classify or analyse them in detail is 

 both impossible and unnecessary. The British colonies present 

 the best examples of complete exhibition, they show us the 

 animals and their products side by side ; elsewhere we see pro- 

 ducts only, except in certain special exhibitions in the English 

 and French departments of a strictly zoological kind, and having 

 little or no relation to economics. As we traverse the nave we 

 catch a sight of skins, furs, fleeces, here and there stuffed speci- 

 mens of birds and mammals, but the forms are those we are 

 mostly familiar with, and it is only when we have sought out 

 and examined the objects we had marked for inspection in the 

 catalogue, that we can take a leisurely view of lions, tigers, 

 parrots, macaws, and reindeer, which are generally placed as a 

 sort of sign-posts to guide and attract visitors to manufacturers' 

 collections of materials and furniture. Still there is as much for 

 the zoologist as he would expect in an exhibition which has for 

 its main idea to illustrate the progress of handicrafts and the 

 mutual commercial relationships of the nations, for of necessity 

 many of the most important industries carry us direct to the 

 ocean, the pasture, the wilderness, and the jungle, and invite us 

 to consider the ways of Nature in fashioning her creatures so 

 that life and happiness may go together, and the combination 

 subserve the purposes of man. The converse might be said, 



