276 THE AMERICAN MONTHLY [Sept 



liquid (mixture of so-called "ozonized" turpentine oil with 

 alcohol, chloroform and a little acetic acid) has been 

 added. This process is equally applicable to bloodstains, 

 and to the detection of blood in urine, and other similar 

 objects, aud may be used as well for the research of re- 

 latively fresh blood, as for that of old dry stains, owing 

 to the fact already observed by Schonbein, viz., that the 

 coloring matter of blood altered by exsiccation even in 

 higher temperatures still shows in unimpaired degree the 

 different "ozone-transferring" properties, and even seems 

 to act more intensely in some respects, for instance, to- 

 wards a mixture of peroxide of hydrogen and cyanine. 



Since the publication of this modification in the meth- 

 ods of detection of blood by means of guaiacum, some 

 observations on different points of solubility of the red- 

 colored blood constituents, especially in dry blood, have 

 taken place, which lead to new propositions concerning a 

 reliable, very short and direct way for the detection of 

 blood, and therefore may be communicated in this 

 Journal, after having been briefly related in the pharma- 

 ceutical section of the annual meeting of German natu- 

 ralists at Brunswick in 1897. By occasion of former 

 studies and experiments on the physical and chemical 

 behavior of chloryl hydrate, a special solvent power of 

 highly concentrated, that is to say, 65 to 80 per cent 

 aqueous solutions of the said compound has been ob- 

 served, not only for several bodies already known, like 

 starch, but also for various very different substances, like 

 certain resins, coloring matters, stearoptenes and also 

 albuminous matters, especially the coloring matter of 

 blood. In fact, experience showed that blood stains 

 which have become dry even for a long time on linen or 

 other similar materials are extracted in a relatively short 

 time by impregnation and contact with a chloral hydrate 

 solutirn of about 70 per cent and more thoroughly dis- 

 solved than by any other treatment. Even blood stains 



