110 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



Saturday was the smallness of the screen upon which his pictures 

 were thrown. For instance, only a small section of a butterfly's wing 

 could be shown at a time, although the screen was as large as the size 

 of the entertainment court would permit, whilst the living organisms 

 in a spot of water and the mites in a small piece of cheese were 

 enlarged until they presented a perfectly appalling spectacle to a 

 timid mind. The capabilities of the apparatus may be imagined from 

 the fact that the eye of a fly was presented in a form no less than four 

 million times its natural size. The electric Microscope, which is 

 worked by an ordinary primary battery, may be said to have extended 

 almost indefinitely the possibilities of presenting in an attractive and 

 instructive manner the wonderful facts of natural science." 



Aylward's Rotating and Swinging Tail-piece Microscope. — Mr. 

 H. P. Aylward has added a new movement to the radial swinging 



Fig. 8. 



tail-piece. Not only do the mirror and the substage swing on 

 separate tail-pieces, either above or below the stage, but they can also 



