302 HOW TO SEE WITH THE MICROSCOPE. 



Mr. Morehouse's results in displaying- objects by re^ 

 fleeted light under the higher powers of the microscope 

 were truly astounding, and his paper read before the 

 Dunkirk Microscopical Society of Dunkirk, arrested 

 the attention of the author, who immediately repeated 

 Mr. Morehouse's observations with the liveliest satis- 

 faction. Mr. Morehouse particularly called attention 

 to the unrivalled views thus given of the podura, 

 adding that they seemed to settle all question as to the 

 nature of these markings. Mr. Morehouse observed 

 also that near the ends of scales the spines were some- 

 times to be seen projecting beyond the scale itself, and 

 the author can affirm the same from his experience. 

 As suggested by Mr. Morehouse the vertical illumina- 

 tor, from the nature of its action dealing entirely 

 with surfaces only not only deprives Mr. Mitchell's 

 paper of argumentative force, but fairly turns his 

 weapons against him, pointing to the podura, indeed, 

 as a very proper object with which to demonstrate the 

 reliability of microscope observations. 



The student will find the study of the podura a valu- 

 able assistance in teaching him the behavior of fine 

 object-glasses over dry mounts, and when he shall by 

 dint of long practice become sufficiently expert to de- 

 tect and appreciate the beauty of the display as given 

 by balsam aperture objectives as contrasted with the 

 work of medium angled glasses, he will suffer no re- 

 grets as to the time and patience this accomplishment 

 may have cost him. 



We have insisted on the use of the genuine English 



