422 C. F. Roberts— Blue Iodide of Starch, 



List of species knoivn to occur in the Devonian of California. 



( Shasta County. ) 



12 3 4 5 6 



Diphyphyllum, sp. undet., or Syringopora. .. x 



" fasciculum Meek ? ? .. .. x 



Acervularia pentagona (Goldfuss) Meek.. .. .. .. .. .. x 



" sp. undet .. .. .. .. .. x 



Endophyllum, n sp. . _ .. _. .. .. x 



Clidopora acupicta Davis ... x 



•' labiosa Billings x .. .. x 



Alveolites cfr. minimus Davis? x .. x _■_ x 



Syringopora Maclurii Billings .. _ _ _ _ x 



Monticulipora, species No. ] x .. ._ x 



" '• No. 2 .. x 



Leptotrypa ._ x 



Gypidula cfr. comis Owen, and G. lotis 



Walcott .. ._ _. .. .. x 



Conch idium ? A small strongly plicated 



form .. .. .. .. .. x 



Terebratuloid cfr. Neioherria .. .. .. ... .. x 



Loxonema cfr. dtlphicola Hall .. __ .. .. x 



" or Murchisonia x 



Murchisonia .. .. .. ' . . .. x 



Bellerophon, muck like the Russian B. sep- 

 tenlrionalis Tsckernyschew, but may 

 be a young specimen of B. perplexa 



Walcott .. .. .. .. x 



Mytilarca sp. undet. .. .. .. .. x 



Orthoceras _ . __ _ . .. x 



Large crinoid columns x .. .. .. x x 



9 4 4 6 3 IT 



C. S. 

 U. S. Geol. Survey, Washington, D. C, March 14, 1894. 



Art. LT. — On the Blue Iodide of Starch ; by 

 Charlotte F. Eoberts. 



[Contributions from the Kent Chemical Laboratory of Yale College — XXX.] 



The interesting article by Mylius* on the composition of 

 blue iodide of starch, and the reply to the same by Stocks,f 

 have suggested to me a few simple experiments, the record of 

 which will perhaps be interesting to others who, like myself, 

 may have been puzzled to decide between the adverse views, 

 especially since the papers above referred to are somewhat 

 lacking, in certain portions, in experimental evidence of the 

 facts stated. 



Mylius derives as the formula for the blue iodide of starch 

 (C 6 BL 10 O 6 I) w HI, in which n probably equals 4, and states that it 



*Ber. d. d. chem. Gesell., xx, 688. f Chem. News, lvi, 212. 



