THE MICROSCOPE 



AUGUST, 1893. 



Number 8. New Series. 



EXTRACT FROM THE PRESIDENT'S ADDRESS BEFORE 

 THE MANCHESTER MICROSCOPICAL SOCIETY. 



By J. F. GOODE, 



MANCHESTER ENGLAND. 



It is very essential that those who intend making microscop- 

 ical study their specialty should take means to render them- 

 selves as conversant as possible with everything that appertains 

 to the management of the microscope. I think all will agree 

 with me that to be able to use the instrument to full effect and 

 gain a correct estimate of the object under examination, it is es- 

 sential to know something of the laws of optic which are con- 

 cerned in the production of a true microscopic image. The util- 

 ization to the full extent of the powers of the microscope can 

 therefore, only be acquired by long and patient study of those 

 principles on which its correct performance depends, and also on 

 the skillful and effective manner in which the objects examined 

 by it are prepared and mounted. It has been the aim of the 

 sub-section to impart this knowledge and several members who 

 are experts have been good enough to give practical demonstra- 

 tions on the Friday evenings. 



I should like here to refer to the new apochromatic objec- 

 tives of Zeiss. These lenses have been in use some little time, 

 but as far as I am aware, have not been exhibited nor described 

 at any of our meetings. A special kind of glass, which posses- 

 ses a wider range in refraction and dispersion than the old 

 crown and flint glass, is used in the construction of these ob- 

 jectives, together with the introduction of special fluorite lenses 



