1885.] 



MICROSCOPICAL JOURNAL. 



229 



I have found asphalt cement and 

 Brunswick black so brittle that I did 

 not test them, but hope to do so 

 hereafter, when I expect to add still 

 other cements to my present list. 



Let it be remembered that the 

 foregoing tests must be looked upon 

 as comparative only, not as absolute ; 

 they were made to assign places to 

 cements in a comparative list. To 

 determine the absolute adhesive 

 strength of a cement a large number 

 of tests of that one cement would 

 have to be made under various con- 

 ditions. I have at present too little 

 time at command to undertake so 

 complicated a series of experiments. 



Orono, Maine. 



courage it as it tends to make micro- 

 scopy more popular and increases its 

 usefulness. 



The New Star Microscope. 



Through the courtesy of Mr. 

 Walmsley we are enabled to present 

 an illustration of the 

 ' star ' microscope, re- 

 cently introduced by 

 the Messrs. Beck. It 

 is an attractive, low- 

 pr i ce d microscope, 

 with rack adjustment, 

 fine focusing screw 

 at the back of the 

 limb, according to the 

 latest and most ap- 

 proved design, sub- 

 stage ring, and swing- 

 ing mirror-bar. The 

 base is solid, and the 

 instrument is admir- 

 ably arranged through- 

 out. Its simplicity 

 and general utility will 

 cause it to be in great 

 demand during the 

 holiday season. Mr. 

 Walmsley declares it 

 is ' the most wonder- 

 ful cheap instrument 

 ever made.' It is rep- 

 resented in Fig. 37. 

 The demand for low- 

 priced but useful nii- 

 croscopes is increasing, 

 and we are glad to en- 



FiG. 37. — New Star Microscope. 



