26 



CLINICAL BACTERIOLOGY AND 



crown of the arch.* Cut off the corners by nicking 

 them with a glass-knife, and mount the spreader on the 

 back of another slide, fixing it with sealing-wax. 



Fig. 14. — Weight Spreader. 



The concavity of the spreader so made will allow for the 

 passage through of the smaller elements, and it follows 

 that as we increase the angle which the spreader makes 



Fig. 15. — Wright Spreader mounted on Another with 



Sealing Wax. 



Note.— The curve has been exaggerated to make the description more clear. 



with the slide we proportionately raise the height of the 

 arch, and so allow the larger elements to pass through. 



* Sir A Wright's " technique of the teat and capillary glass tube." 



