Caricography. 245 ' 



tall narrow phial surrounded by a freezing mixture. The horizontal 

 portion of the tube near the bend should likewise be refrigerated. 

 The apparatus being thus arranged, introduce a sufficient quantity 

 of the bicyanide of mercury into the tube, and close it by inserting 

 the stuffing box with its rod. In the next place, by means of the 

 gallows screw, make a communication between the cavity of the tube, 

 and a self-regulating reservoir of sulphydric acid. This gas must be 

 allowed to pass into the tube very slowly, and meanwhile, by means 

 of the rod, the bicyanide is to be stirred. Before long a portion of 

 the cyanhydric acid will be seen in the narrow part of the tube. 

 This serves to regulate the admission of the sulphydric acid, since, 

 when the quantity passing into the tube is inadequate, the liquid will 

 rise in the tube ; when too great, it will be expelled from it. By 

 these means, after a httle while, all the bicyanide will be decompos- 

 ed, and a corresponding quantity of acid collected in the refrigerated 

 phial. 



Akt. XI. — Caricography ; by Prof. C. Dewey. 



Appendix, continued from Vol. xxviii, p. 276. 



No. 145. C. cryptocarpa, Meyer.* 

 Tab. W. fig. 69. 



Spicis distinctis ; staminiferis superioribus subternis et partim ses- 

 silibus ; pistilliferis distigmaticis subternis cyhndraceis pedunculatis 

 et interdum superne staminiferis ; fructibus obovatis utrinque con- 

 vexis brevissime rostratis ore integris, squama oblongis longo-lanceo- 

 latis duplo vel triplo minoribus. 



Culm two feet high, large, stiff, erect, very scabrous above, tri- 

 quetrous, with long and large leaves ; bracts long, leafy, with scarcely 

 any sheaths ; staminate spikes 3 — 4, upper ones sessile, with oblong 

 obtuse and brown scales ; stigmas two ; pistillate spikes about 

 three, long, cylindric, often staminate above ; fruit obovate, convex 

 on both sides, smooth, with a very short beak and entire mouth ; 



* C. A. Meyer, M. D. in the " Memoirs of the Imperial Academy of Sciences, 

 Vol. I. N. S. 1830." St. Petersburgh. Dr. Meyer described and figured twelve 

 species as new and found in Russian America. Several of these have been found 

 also in other northern regions of America. 



