52 The Microscope. 



In the next higher grade of the less expensive commendable 

 forms, there are two to be considered, Messrs Bausch and Lomb's 

 " Model," and Mr Zentmayer's "American Student." So far as 

 appearance, size, workmanship and divided body tube are con- 

 cerned, there is here little to choose. Mr Zentmayer's " Student '' 

 stand has the disadvantage of costing five dollars more than the 

 " Model," but it is, without exception, the best and most desirable 

 of the lower grade instruments in this country, or in any other. 

 It has coarse and fine adjustments and swinging mirror, as the 

 " Model " also has. It possesses an abundance of room between 

 the stage and the lower end of the arm, as the " Model " does not, 

 the latter at that point being most inconveniently contracted. 

 If the difference in price is important to the beginner, he may 

 safely select the " Model," to which may be added a rotating 

 glass stage, a luxury not applicable to the "American Student 

 Stand," otherwise by all means take the Zentmayer,- 



Equally desirable with either of the two preceding stands 

 is the "Acme No. 4 " of Messrs J. W. Queen and Co. The fine 

 adjustment screw, which is beneath the arm, the makers claim 

 to be a great convenience, and that " it is of great delicacy and 

 truth of motion in the axis," focussing a one-twentieth inch ob* 

 jective with ease and accuracy. The price is the same as that of 

 Mr Zentmayer's "American Student." 



Either of the foregoing is well adapted to the every day work 

 of a practising physician. For urinary examinations these 

 admirably answer, and according to 'my opinion, they are the 

 least costly instruments that can be recommended for that pur- 

 pose. If the physician intends to make more delicate investiga- 

 tions with higher powers, if he wishes to enter even a little way 

 into Bacteriology, he must seek a stand that shall be more com- 

 plete in its sub-stage arrangements than is any of these, for to 

 none of them can a sub-stage condenser be added and this 

 accessory is now essential for even the least advanced Worker. 

 For play it is not needed. 



One or two upward steps reach Messrs BaUsch and Lomb's 

 "Investigator," and Mr Zentmeyer's "American Histological." 

 Both are the same in price, both have the same conveniences, 

 and both possess a centring sub-stage. The " Investigator " has 

 a graduated circle at the summit of the mirror-bar, but if the 

 choice were limited to these two, which should be finally selected 



