92 IMITATIVE COLOURING 



The ductless glands, before alluded to as lining the coats of the 

 abdomen, and serving as aids for the circulation of the blood, 

 must also be left for the present. 



Not so, however, the muscles. Distributed throughout all 

 parts of the body for individual movement of each member, 

 they are mustered in strong force in the thorax. Indeed, they 

 almost fill this region, so many and so large are they. Their 

 function is of course to give energy to the wings especially, 

 and also to the legs and halteres. Part lie at the sides of 

 the thorax, running from back to front, so to speak, and part 

 lie between these, and run along from the head to the abdomen. 

 They consist of bundles, and these again are separable into 

 filaments. They are plentifully supplied with air, having air- 

 vessels running among them in all directions. 



Thus my paper, but not my subject, comes to an end. 

 Though very imperfect, it will at least serve to show that the 

 despised House-fly is not so insignificant as it appears, even in 

 itself; while as a member of a community so widely spread 

 and so numerous, and so potent for good and ill, it takes a 

 very important position indeed. 



" Think naught a trifle, though it small appears ; 

 Small sands a mountain, moments make the year, 

 And trifles Hfe." 



Jmitati\)e Coloutitio tn jfisb* 



By John Brigg. 



THE fish upon which I have tried my experiments are common 

 Goldfish. A few words as to the condition in which they 

 usually live and breed may not be out of place. The large 

 supplies which find their way to the London market are derived 

 principally from the mill-dams in Lancashire and Yorkshire, where 

 steam-power is used. Two conditions are necessary in order to 

 rear Goldfish in large quantities, viz., clean water and a warm 



