632 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



strong zinc cylinder A, having funnels B, C, at the lower and upper ends. 

 To the top of the cylinder is soldered a circular vessel E, with overflow 

 pipe F. The lower funnel is fitted with a gas-tap D, and the whole 

 apparatus rests by means of three legs on the top of a wooden box. 

 Inside the box are fillets for the support of shelves, and in the top of 

 the box is a large circular hole. The vessel having been filled with 

 sand, the water-tube is connected with the gas-tap, and when the latter 



Fig. 75. 



is turned the water bubbles up through the zinc vessel. When the sand 

 is clean the water-tube is disconnected, and the clean sand drops through 

 the hole into a suitable vessel placed on the shelf of the box. 



New Method of obtaining Hsemin Crystals.*— Sarda and Caffart 

 refer to the method of A. Lecha-Marzo for detecting blood. This 

 method consists in treating the spots with a solution of iodin, pyridin, 

 and ammonium sulpiride. The authors modify the foregoing by sub- 

 stituting chlorin and bromin for iodin, and give the following pro- 

 cedure. Place on a slide a drop of blood solution, and evaporate 

 slowly at a moderate temperature. Add successively a drop of chlorin- 

 water, a drop of pyridin, and a drop of sulphide of ammonium, and 

 then put on a cover-glass. With a magnification of 500, crowds of 

 crystals of chlorohaBinatin will be seen. The size is variable, the shape 

 is rhomboidal, and the colour red or brownish-red. Exposed to the 

 action of air the crystals do not keep long ; the preparations should 

 therefore be ringed round with balsam. 



The authors explain the production of the crystals by supposing that 

 the oxy-hasmoglobin is first changed into alkaline hasmatin, then into 



Comptes Rendus, cxliii. (1906) pp. 251-2. 



