{ 652 ) 



Wiis shown Ity lakiiiu' llic iii('lliii,u|><>ijii ot' a inixlni'o of tlio Iwo 

 snbstaiK'OS ; no loworinu' of the iiiolliiiüiH)!)!! was iiolicod. It is 

 Iherofore pi-oved tlial from tolraiiitroaiiisol and NaOCH., Ihe trhnolh}!- 

 elher of dinilroiildoi-oglncinol is ohlainod and ('(>nse(|nonlly the con- 

 stilütion of Ihe lelranitroanisol is: 



0„H OCH3 (NO,), 1. 2. 3. 5. Ü. 



OCH3 OCIIj 



NOi/XNOj N0../\X0., 



1 I -> II' 



NO.X /NOo CII,()\ /OCIT, 



ïf s\inin(>lrical li-il)i'oinodiinlrol)on/,ono is treated in ah'oholic solnlion 

 wilh six niols. of nielhyhiinine, the ihi-ee Itroniine aionis are i'eadily 

 replaced In NHCII3 and we obtain line orange red needles ni.p. 220° 

 (wilii deeoniposition}. When this synnnelrieal C„1I(X0,), (NliCH3)3 

 is dissolved in nitric acid of 1.52 sj). ,ur. and then dilnled Avilh water 

 a line w hite crystalline |)o\\<ler is obtained \\ liich. w hen dissohed in 

 glacial acetic aci<l. deposits small beantifnl while needles, w hicli explode 

 between '200^ and 203°, somelimes cansing a llanie. Fi-om the analysis 

 it appears that this is the symmetrical triiutro|»liejiyltrimelhyllrijiitramiue. 



NO., 



Nile; II:, Ncfr, 



NO../ \NO.j NO/ XNo-.. 



cir,iiN\ ysunh rii;>^\/4iu 



.NO,, 



Geology. — "Tiro AVzr ^fi(l'(^(llll)l'i(lll Enuilic-IUocL-s fi\nii. the 

 Dtilch Dihiriiinr . \\\ .1. II. UoNNKMA at Leeuwarden. (Com- 

 municated by Pr(tf. J. W. Moll). 



1. When 1 had been appoiiUed assisiant at the (reological-Minei-alogic 

 Institiile at (n-oningeu, 1 was cliai-ged wilh the task of determining 

 the fossils that ai-e found in the collection of Groningen se<limentary 

 erratic-blocks. If \\e succeed i]i this with a fossil, we can as a rule 

 more or less accnrately, for the erratic-block in which it occurs, lix 

 the age of the layer of which it formerly formed jiarl ; at the same 

 time it may be found out whether suchlike stone is still known as 

 iirm rock, — and whether the same kinds of erratic-blocks have 

 been met with in any other places. 



With many pieces I succeeded, but with a not inconsiderable 

 number I failed, owing to various causes. To the latter di\ision 

 belonged i. a. two small pieces of lime-stone, the largest dimensions 



