( 309 ) 



A substance of the same structure has been described by Thiele 

 and Pickard '), who prepared ii from the potassium salt of the 

 acetylated cinnamo-hydroxamic acid. As thej give the melting point 

 as 115 . ami as, in another respect, their observations do not quite 

 agree with mine, the urethane was prepared by Mr. W. Ochtman, 

 in ilic manner indicated by Thiki.k and Pickard for the purpose of 

 comparison. 



The two substances appeared to lie quite identical; the melting 

 point was found to be 122" — 123° and a mixture of the two melted 

 at the same temperature. 



C,H 5 C h =C h -(Pnh » 



C,H 6 CH=CH-N"-Co 



( n ,<n = ('i[_('Mii C,H S C" CH-COK -^ 



% % 



NOH NO-CO-CH, 



This ready formation of urethane in an aqueous-alcoholic alkaline 

 medium is remarkable. 



I ascertained that this reaction also takes place with a derivative 

 of cinnamic acid. From o-nitro-cmnamide is formed the o-nitrostyryl- 

 aminoformicmethyl ester : 



C a H 4N o 5 — CH=CH — NH— C0 0CKj 



This crystallises in bright yellow needles mp. 149—150'. 



0,2009 gp. yielded 0,3956 gr. CO, and 0,0781 gr. H a O. 

 0,1457 „ „ 15,8 cc. N 3 at 15 c and 758 m.M. 

 Found : ' 53,70 ■ , C ; 4,36 ■ , 11 and 12,60 ' .\ 



Calculated for C 10 H l0 O 4 N s : 54,03 7,0; 4,55 %• H and 12,61 % N. 

 A fuller communication will follow in the Keeeuil. 

 , . , . - - wwi- Chemical Laboratory of the 



Technical High School. 



Meteorology. - - "The analysis of frequency-curves of the air- 

 temperature." By Dr. J. P. van der Stok. 



1. The question in what way the characteristic details of frequency - 



curves of different kinds may be pointed out in a striking way in a 

 pliant, analytical form has again been treated extensively in a recent 

 work 2 ). 



The aim of this communication is to fix the attention on the 



i) Ann. 309, 197. 



-) H. Brums, Wahrscheiolichkeitsrechnung Had Kollektivmasslehre, Leipzig und 

 Berlin, Teubner, 1900. 



