352 THE AMERICAN MONTHLY [Dec, 



One is ihc ilivision of Mi«'n).s<'(>pts and acoessorios, Microtomes 

 and accoFsories, and apparatus for Photo-Micro};raphy, and 

 Bacteriolojiical and Laboratory su])plies, each article being dis- 

 tinctivrly cnuincrated under their respective headings. There 

 is eniboilied in this edition as complete a line of apparatus as 

 is needed for general Microscopical work, both for the individ- 

 ual as well as for laboratory i>urposes. so that the catalogue is a 

 handy reference book for the intending i>urchascr. 



We note the fact that the s]tiral rack and pinion is used only 

 for the coarse adjustment, and that they are cut with specially 

 devised automatic machinery. 



Among new instruments we notice the W Laboratory Dis- 

 secting microscope which is designed for use in lal)oratories. 

 There are some changes in the construction of Microtomes; the 

 object holder with its various adjustments is made considerably 

 heavier; its vertical adjustment on the slide is made to act with- 

 out disturbing the relation of the specimen to the knife and the 

 inclination of the object in either direction by universal joint ; 

 the method of feeding the screw has been changed to remove 

 the possibility of making failures ; permanent lever which is 

 provided with a reversible pawl acts in either direction on the 

 milled edge of the disk and works within a definite limit which 

 is prescribed by two set screws attached to the arc of a fixed 

 circle. 



The list of Bacteriological a])paratus, Water-baths and ovens, 

 has been considerably increased. In the line of glass-ware, they 

 have increased their stock of such articles as are most needed 

 for Bacteriological Laboratories. A pocket set of dissecting in- 

 struments in leather case is considered very unique and will 

 meet with a great deal of favor on account of it.s neatness and 

 practicability. 



There will be found a number of testimonials from well-known 

 scientists who have uped the Continental and American type of 

 microscopes and objectives. 



Another new feature is an article on Microtome knives and 

 their care, which we consider very important, as it gives con- 

 siderable information on the suV)ject, valuable to the user of 

 microtome knives. They also include aside from the microtome 

 knives a series of section razors, hones and strops. 



