208 FRAGMENTS OF SCIENCE. 



Bailey's beads, the advance of the shadow through the 

 air, the appearance of the corona and prominences at 

 the moment of totality, the radiant streamers of the 

 corona, the internal structure of the flames, a glance 

 through a polariscope, a sweep round the landscape 

 with the naked eye, the reappearance of the solar limb 

 through Bailey's beads, and, finally, the retreat of the 

 lunar shadow through the air. 



I was provided with a telescope of admirable defi- 

 nition, mounted, adjusted, packed, and most liberally 

 placed at my disposal by Mr. Warren De La Rue. The 

 telescope grasped the whole of the sun, and a consider- 

 able portion of the space surrounding it. But it would 

 not take in the extreme limits of the corona. For this 

 I had lashed on to the large telescope a light but 

 powerful instrument, constructed by Ross, and lent to 

 me by Mr. Huggins. I was also furnished with an ex- 

 cellent binocular by Mr. Dallmeyer. In fact, no man 

 could have been more efficiently supported. It required 

 a strict parcelling out of the interval of totality to em- 

 brace in it the entire series of observations. These, 

 while the sun remained visible, were to be made with 

 an unsilvered diagonal eye-piece, which reflected but a 

 small fraction of the sun's light, this fraction being 

 still further toned down by a dark glass. At the 

 moment of totality the dark glass was to be removed, 

 and a silver reflector pushed in, so as to get the maxi- 

 mum of light from the corona and prominences. The 

 time of totality was distributed as follows : 



1. Observe approach of shadow through the air : totality. 



2. Telescope . . . .30 seconds. 



3. Finder . . . .30 seconds. i 



4. Double image prism . . 15 seconds. 



5. Naked eye . . 10 seconds. 



6. Finder or binocular . . 20 seconds. 



7. Telescope . . . .20 seconds. 



8. Observe retreat of shadow. 



