( ^^^ ) 



The two corona negatives show traces of the corona rings I 3987 

 and I 5303. In consequence of the general cloudiness the plates are 

 veiled, to which it is undoubtedly owing that the very bright green 

 corona ring, Avhich visually was so clearly visible, has produced such 

 a faint image. 



The plate taken of the second flash failed entirely because the end 

 of totality took place 20 seconds earlier than had been computed, 

 and took me by surprise while I changed the plates. 



Also the first flash came 20 seconds before the time computed ; 

 fortunately through a window in the tent I obser\'ed the rapid 

 approach of totality, and could start the series of 5 exposures long 

 before the warning sign agreed upon was given. It later appeared 

 that the second negative has caught about the second contact. 



The second negative shows a great variety of details, which in 

 the ultra violet have suffered so much from absorption that for those 

 parts of the spectrum the first negative, taken 3 seconds before 

 totality', forms a very welcome supplement. These two spectra together 

 show between ?. 470 and ;. 367 350 crescents of very different 

 length and brightness; in the discussion of the meaning of the 

 observed particulars the three other negatives may also be used to 

 advantage. This discussion is reserved, however, for a more detailed 

 report; I only mention that the enigmatic doubling of the flash 

 crescents of 18 May 1901 can, in the case considered here, occur 

 only for wave-lengths above y 434. Though from this it follows 

 that the doubling may be partly due to the slanting position of the 

 plate the possibility of the existence of double lines in the flash 

 spectrum is noways excluded by this. 



A closer consideration of this question is also reserved for a more 

 detailed report. 



Supplement III. Report on the opei^ations ivith the two sUt-spectro- 

 graphs for the solar eclipse of August 30, 1905 by 



J. H. WiLTERDINK. 



Operations at Leiden. The instruments, constructed for the solar 

 eclipse of 1901 arrived here such a short time before they had to 

 be sent off to Sumatra that a thorough investigation of them was 

 then quite out of the question. This has been made now. 



As had been decided upon the siderostat provided with a coelostat 

 apparatus would serve to feed the three spectral apparatus, and in 



