43 



all my perseverance, tili properly instructed, 1 never coiiUl discover niore tlian a Single one, iior was tliis in a vesicle. At llie 

 same time an old vvonian, who hacl consulted me for her niece, foiind no dilllculty in detecting several, biit these were not in 

 the vesicles. In vain did I even submit patiently to her instruetions. My friend Banger, whose patience in every investigution 

 of natural history infinitely exceeds whatever I have met >vith, even in professed naturalisls, was for the most part, as unsuc- 

 cessful, or if he succeeded oftener, his success was not in any degree proportionate to Ins unremitting application." 



Adams führt dann an, dass er das Ei der Krätzmilbe nicht habe finden können, was auch i)ei der Kleinheit desselben 

 wohl zu erwarten gewesen ; nur ein oder zwei Mal habe er Milben angetroffen, die kleiner gewesen wären, als diejenigen, die 

 gewöhnlich mit der Nadel hervorgeholt, und welche für jüngere, unlängst aus dem Ei geschlüpfte Milben gehalten werden 

 müssen. Das Geschlecht der Milben, ob weiblich oder männlich, habe er ebensowenig wie Bonomo unterscheiden können. Hier- 

 auf sagt er dann: ,,but there is one pecularity, which, as he does not remark, probably he never witnessed. This is a power 

 of leaping with a force not less than a flea. Such was the case with one whilst I was examining- it under a convex Jens. 

 Wether these leaps were repeated we could not assertain , on account of the minuteness of the object and its g-ray complexion ; 

 but whilst we were expressing our surprise, the old wonian, our tutoress, appeared unconcerned, and assured us that the event 

 we had witnessed was by no means uncommon. I have collected the same account from several other people." Dieses Springen 

 der Krätzmilben habe ich nie bemerkt, es auch von keinem anderen Autor als Adams erwähnt gefunden, und deshalb diese 

 Mittheilung" hier mit aufgeführt. Es ist wahrscheinlich, dass diese schnelle Entfernung der Milbe von dem ihr angewiesenen 

 Orte nicht durch sie selbst, da die hierzu nöthigen Organe der Krätzmilbe fehlen, sondern durch die nicht wahrgenommene Ent- 

 fernung eines Fädchen oder Haares, welches an der Milbe haftete etc., herbeigeführt worden ist. 



Pag. 295 theilt der Verfasser Folgendes über den Uebertragungsversuch der Krätzmilbe mit: ,,In July, 1801, I procured 

 two ouföes from the young woman, whose aunt consulted me for the eure of her niece. The old woman, without spectacles, 

 which she always used when working with her needle, but not without much diligence and nicety, extracted them from the 

 girl by means of a pin, and placed them between the flngers of my left band, the skin of which, and I believe of my whole 

 body was entire. They remained apparently without any disposition to move, as long as I watched them; but on examination 

 two hours after, nothing was to be discovered but a small desquamation of the cuticle." 



„For more than three weeks little or no inconvenience was feit. From that time began frequent itching in different 

 parts of my body and arms, but no eruption could be discovered. In less than a fortnight afterwards, my arms and belly were 

 covered with a general elTlorescence , but few vesicles appeared. 1 applied to my old woman, who readily drew two ougöes 

 from my arm, but not from the vesicles ; indeed on this, and on all other occasions, I could not help remarking, that, though 

 I could not discover what the marks were by which she was directed , yet she constantly passed over the vesicles, without 

 suspecting them to be the nidus of the insect. At length I perceived it was a small slightly discoloured elevation of the cuticle, 

 which appeared as if soon likely to become vesicular, that the woman always attacked, but not always with success. However, 

 she constantly answered to our enquiries, that were the bladder was formed, the ou^ao had left the spot." Auf den folgenden 

 Seiten giebt Adams nun eine nähere Beschreibung der Symptome der sieb bei ihm entwickelnden Krätze, die sich schnell über 

 Arme, Lenden etc. ausbreitete und ihn, da Fieber, Kopfschmerzen etc. sich einstellten, und ein Glied seiner Familie auch von 

 der Krätze befallen wurde, veranlassten, kurativ gegen das Leiden einzuschreiten. Er wandte gegen dasselbe wiederholentlich 

 Einreibungen einer Salbe von weissem Präcipitat an, nach welchen es sehr bald verschwand. 



Was nun den Versuch, den Mr. Banger an sich anstellte, anl)etrifft, so theilt er hierüber pag. 298 Folgendes mit: 

 ,,In the mean time white my friend. Banger, had begun a similar experiment on himself. He borrow^d a Single ougöen of me, 

 and its multiplication soon showed itself. The first part in which he discovered elther itching or eruption, were the inside of 

 his left arm, near the axilla, and that part of the ehest, which comes in contact with it. This he imputed to his habit of sleeping 

 with his right band in that position. At first he used no means of eure but warm bathings. He next tried dry frictions of 

 j)rimstone over such parts only as showed the eruption, or gave the Sensation of itching and gained some assistance from 

 them, but was not cured without a sulphur ointment; and the efllcacy of this was slower than I have usually found from the 

 white precipitate ointment.'' 



Pag. 299 führt Adams an, wie Banger in einem Falle die Krätze bei einem Kinde dadurch heilte, dass er die Krätz- 

 milben mit der Nadel herausnahm. Die betreffende Mittheilung ist folgende: ,,My friend, Mr. Banger, brought a child to his 

 house much covered with the disease, that he might learn to extract the insect himself. He was so diligent in the lessons he 

 received daily from an old domestic , that in about six weeks the child afforded no more oucöes , though all remedies were 

 ^^arefully avoided etc." 



Ueber den Ort, wo die Krätzmilbe zu finden ist, sagt er pag. 299: ,,In searching for the insect, in which I was 

 regularly instructed by the old lady before mentioned , the bladder is always passed over, if a red, and as it appears by the 

 microscope, a some what knotty line is discovered to issue from it-, at the end of this line, which is about a quater of an 

 inch long, is found a reddish elevation to appearence dry and firm. Under this, parts of the oufao are some times discoverable 

 with a good glass; but wether such is the case or not, this is the only place in which the ou^ao is expected, and if not found 

 liere, the search is abandoned." 



Aus Monfet's ,,Theatrum insectorum etc." citirt er auf Pag. 306 den von Le Jeiine dem Jac. Guillemaeus mitge- 

 theilten Fall von Syrones in der (]onjunctiva und lässt dann einen Brief von Sir Joseph Banks folgen, in welchem eine ähn- 

 liche Beobachtung kurz mitgetheilt wird. Banks sagt liieriFi Folgendes: ,, Several persons belonging to the Endeavour hrig, 

 while at Olahcite for the purpose of the observations on the transit of Venus in 1709 were troubled with a severe and tormenting 



ir 



