APPENDIX BY TRANSLATOR. 



APPENDIX A, RELATING TO THE ACAKINA. 

 I. 



THE case referred to in the text (p. 64), in which a species of 

 Acarus was found beneath the cuticle surrounding a sore in the 

 sole of the foot of a negro, is related in the ' Microscopical 

 Journal/ vol. ii, p. 65, pi. iv, fig. 7, 1842. 



The man was admitted into the Seaman's Hospital with large 

 sores on the sole of the feet, of a very peculiar character. The 

 appearance of the sores conveyed the impression that more or 

 less circular portions of the enormously thick cuticle had been 

 gnawed or cut out, leaving the surface of the corion exposed and 

 covered with prominent papillae, and affording a sanious discharge. 

 The border of cuticle surrounding these excavations was under- 

 mined, as it were, by irregular galleries, which penetrated to 

 some distance between the cuticle and corion, or rather in the 

 soft deep layer of the cuticle. On examining the secretion of 

 one of these sores, Mr. Busk noticed the Acarus in question, 

 which was dead, and apparently partially crushed, as represented 

 in the figure. It was supposed that the disease, for which no 

 other obvious cause existed, and which was undoubtedly of a 

 peculiar character, might have been caused by the burrowing of 

 these creatures beneath the thick cuticle, which thus became 

 irregularly detached, being, as it were, undermined by galleries 

 branching in all directions. The disease was attributed by the 

 man himself to the wearing of a pair of shoes which he had lent 

 to another negro, whose feet had been similarly affected for 

 nearly a year, and who wore the shoes thus lent for a day or 

 two. The negro, whose feet were affected in the way described, 



