620 



REPORT — 1903. 



III. PhenonajihtJiacridines. 



The plienonaplitliacridines liaye been chiefly investigated by Ullmann. There 

 are three possible types : — • 



CH 



Nj8 



C;S 

 (Schopff) 



N /3 



I 

 U o 



(Nalband-UllmaDD) 



C/3 



(A dihjdroxyacridone of 

 this type — Lagodzinski 

 and Hardine) ^ 



The notation is a modification of that which I have suggested for dinaphth- 

 acridines, and the numbering is that of Ullmann. 



Numerous derivatives of phenonaphthacridines are known, and they all possess 

 the characteristic physiological properties and the fluorescence which characterise 

 acridines generally. The remarkable tendency to the formation of the acridine 

 grouping has recently been shown by Ullmann and Baezner. These inquirers find 

 that alcohol may replace aldehyde in acridine synthesis, oxidation taking place in 

 the course of the reaction. 



IV. Neio E.ijieriments, 



Experiments now in progress indicate the possibility of new acridine types and 

 Iso the_ generality of the methylene diiodide reaction. With the assistance of 



of 



also 



Miss Micklethwait I have already obtained fluorescent products indicating the 

 formation of a dianthracridine and a naiAthanthacridine. and of other acridines 

 not previously obtained by the methylene diiodide method. 



10. Sur le Spectre de ^ Self-induction' du Silicium et ses Comparaisons 

 Astronomiques. Par le Comte A. de Gramont, Docteur es Sciences 

 Physiques. 



Plusieurs raies du silicium reconuues dans les spectres stellaires ont €t€ 

 consid6r&s comme caracteristiques dune haute temperature, et j'ai cru int^ressant 

 d"(5tudier leur maniere de se comporter sous I'influence de la ' self-induction,' et de 

 donner ici la partie du spectre susceptible de comparaisons astronomiques. Les 

 spectrogrammes portaient a la partie superieure, le spectre d'^tincelle condens^e 

 ordinaire du silicium obtenu avec uue bobine d'induction donnant 15 c/m 



