QUARTERLY CHRONICLE OF MICROSCOPICAL SCIENCE, 405 



particles of No. 1 of Prof. Reese's set were broken up with a 

 sharp knife upon a slide and covered with a thin glass. The 

 minute masses of dried clot thus obtained were then irrigated 

 by I per cent, salt solution until nearly decolorised ; a 

 drop of aniline solution was then allowed to flow in beneath 

 the cover, and in half a minute washed away and replaced 

 by salt solution. The object was then examined with 

 l-25th immersion lens, and numerous coloured and colour- 

 less corpuscles were easily found. Ten measurements of 

 coloured corpuscles gave a maximum of l-3125th of an inch, a 

 minimum of l-3572nd, and a mean of l-340Tth. Specimen 

 No. 2, similarly treated, gave a maximum of l~4444th, a 

 minimum of l-4878th, and a mean of l-4694th ; and No. 3 

 gave a maximum of l-5405th, a minimum of l-6666th, and a 

 mean of l-5828th. Dr. Richardson concluded that No. 1 was 

 human. No. 2 ox, and No. 3 sheep's blood, and was "entirely 

 correct." The second series was similarly examined, and 

 yielded the following results : — No. 1 gave a maximum of 

 l-4347th, a minimum of l-4878th, and a mean of l-4662nd; 

 No. 2, a maximum of l-5405th, a minimum of 1 ••6450th, and a 

 mean of l-5952nd; while No. 3 gave a maximum of l-3175th, 

 a minimum of l-3572nd, and a mean of 1.3430th. Dr. Richard- 

 son here again rightly decided that No'. 1 was ox. No. 2 sheep's, 

 and No. 3 human blood. In no instance do the minimum 

 diameters of human blood-corpuscles closely approach the 

 maximum even of those of the ox. Dr. Richardson recom- 

 mends that in examining spots of blood more than 1-lOth of an 

 inch in diameter fragments should be scraped from the edges 

 or thinnest part of the stain, because the central portions show 

 numerous fibrin filaments which form a meshwork more or 

 less obscuring the corpuscles. He found that a specimen of 

 dried human blood five years old still showed multitudes of 

 corpuscles, which could easily be distinguished from those of 

 the ox or sheep in the above manner, a mean of ten measure- 

 ments giving 1- 3425th inch. Dr. Richardson has thus proved, 

 in opposition to the statements of writers on medical jurispru- 

 dence, that human blood-stains can be positively distinguished 

 by the microscope even five years from the date of their 

 production from those caused by some other animal s blood. 



2. Numeration of Red Corimscles in the Blood. ^Y Dn 

 Malassez, Paris (Abstract in ' London Medical Record, 1874, 



^' IV Epithelium.— 1 . On the Epithelial Arrangement in Front 

 of the Betina and on the External Surface of the C^P^'f^V 

 the ie«5.— Ewart (' Journ. of Anat. and Physiol.,; May, 1874, 

 p. 353) examined these parts in the eyes of various animals 



