ZOOLOGY AND BOTANY, MICBOSCOPY, ETC. 



117 



means of which the thinnest objects can be held as firmly as the glass 

 zoophyte troughs, The bar with rack motion is constructed on the best 

 principle by which wear and tear can be compensated for, by simple 

 adjustment of the screws, thus insuring absolute absence of all shake. 



" If desired, the image, by a special contrivance superior to the usual 

 right angle reflecting prism, can be thrown direct on the paper for 

 drawing. It has a new form of diaphragm arrangement, by which the 

 aperture can be changed with great facility. 



" The Microscope can be adapted, say to the centre lantern of a 

 triple, while the other two can be utilized for showing ordinary photo- 

 graphs and photomicrographs to consecutively illustrate a given object 

 under different phases without leaving the screen blank." 



Hughes' Special Combination Scientist Optical Lantern. — Mr. W. 

 C. Hughes has patented the new form of lantern shown in fig. 8, in 



Fi<? 8. 



virhich he " lays claim to having supplied a want long felt by the profes- 

 sional lecturer, both in the class-room and in the theatre, namely, that 

 of rapidly throwing upon the screen (a) the general view of an object 



