226 Transactions of the Society. 



How many gauges and of what sizes they should be are 

 questions which could be settled by a committee consisting of some 

 of the English and foreign makers, together with two or three 

 competent workers. By the deliberations of such a committee, 

 under the auspices of this Society some years since, we obtained 

 the Society or universal screw, which, as well as the Hartnack or 

 Continental, are still the usual gauges both here and abroad. 

 I think that the time has arrived when this, as the parent Micro- 

 scopical Society, should offer facilities for determining the standards 

 for such other parts of the instrument as would enable the apparatus 

 of one maker to be used with the stand of another. 



