76 JOURNAL OF THE [Octobcr, 



smaller than the last. These plates are triangular, but the lines 

 forming the triangles are curved, and the edges of the plates 

 themselves are beveled. Mr. Hanks remarked further that it 

 could be seen by the enlarged crystal shown under the micro- 

 scope and by drawings exhibited that each triangular plate was 

 composed of three smaller triangles and that all the lines were 

 slightly curved. The building up of plate upon plate causes 

 the channeled edges and the somewhat globular form of this 

 exquisite crystal. The sketches shown were made from the 

 diamond, while in the field of the microscope by the aid of the 

 camera lucida, being enlarged about ten diameters. 



A close examination of the crystal revealed tetrahedral impres- 

 sions as if the corners of minute cubes had been imprinted on 

 the surface of the crystal while in a plastic state. These are the 

 result of the laws of crystallography, as were seen by the faint 

 lines forming a lace work of tiny triangles on the faces when the 

 stone is placed in a proper light. Professor Hanks concluded 

 with the remark that it would be an act of vandalism to cut the 

 beautiful crystal which is a gem in two senses, and he protested 

 against it ever being defiled by contact with the lapidary's wheel. 



The diamond was placed under the microscope and arranged 

 by Professor Hanks to demonstrate the points of his very accu- 

 rate description. It was a beautiful object and was admired by 

 all present. 



Dr. Riehl, of Alameda, gave a demonstration of discovering 

 tubercular bacilli in the sputum of consumptives. He proceeded 

 with the operation of staining, decolorizing, etc., and finally 

 showed the minute germs clearly under the lens. Dr. Riehl 

 made no claim to originality in the method employed, but showed 

 how he handled the material so as to disclose the bacilli quickly 

 for purposes of diagnosis. Discussion ensued as to the value of 

 different methods, Dr. Ferrar and Dr. Mouser maintaining the 

 value of the careful and exact methods of procedure laid down 

 by the German investigators for purposes of exact determination. 

 Dr. Mouser showed a very handsome piece of apparatus called 

 " Schlessing's Thermo Regulator," which he had just received 

 from Germany. It is to be attached to the incubator used in 

 cultures of bacilli, etc., in such a way that the water of the in- 

 cubator comes in contact with the rubber plate of the regulator 

 and expands it. This expansion of the rubber presses upon the 



