On Large Stands for High Powers. 9 



STAND CONDENSEK. 



It is better to use the direct light of the lamp without 

 the intervention of a stand condenser, as by this instru- 

 ment the light is diffused and the sharpness of definition 

 impaired. A stand condenser is required to throw a 

 light on opaque preparations, but as these are not often 

 used by the student of Histology, it is not required by a 

 beginner. 



ON LARGE STANDS FOR HIGH POWERS. 



THE advanced student will require a Stand with me- 

 chanical stage and sub- stage when he makes investi- 

 gations into minute structures with high powers, and 

 for this work it is most important that the mechanism 

 of the Stand should be of the very best description. To 

 get this he must go to the best makers, and of course be 

 prepared to pay a high price. 



The best Stands are made by Messrs. Powell and 

 Lealand, and Messrs. Boss and Co. 



The author has used a No. 2 stand of Messrs. Powell 

 and Lealand for a long time, and found it all that 

 could be desired. 



ON THE BINOCULAR MICROSCOPE. 



THE binocular microscope has not met with much favor 

 from Histologists as yet, from the fact that no power 

 above a % inch could be used without a special stand or 

 apparatus costing a large sum. As, however, it has 

 been shown by the author* that the binocular can be 



* See Quarterly Journal of Microscopical Science for July, 1880. 



