AND CONTENTS OF THE MOUTH. 69 



in our plate, together with the others simply pointed out in the 

 text, can be reduced to two species, viz. : Bacterium termo and 

 Leptothrix. 



The forms a, b c, above (Fig. 2, PI. VII.*), d, e,f,f\ g, z, k, /, /, 

 /, and p\ apply to Bacterium termo ; the forms b\ c (below), m^ «, 

 n\ (left), ^, /', i", z/, v^ v\ X, x\ y, and z, to Leptothrix. And it is 

 not improbable that, in their turn, the two species, according to 

 Cohn, Naegeli, De Bary, and others, may form only one. These 

 authors classified the round Bacterium {rnonas crepusculum), Bacte- 

 rium termo and Leptothrix^ as three forms or developments of one 

 and the same species. 



I am rather inclined to believe that even the forms known 

 under the names of Vibrio rugula, clostrium^ and rhabdomonas may 

 be attributed to the same species, as three simple varieties of its 

 bacillary forms." I base these conclusions upon indirect signs, 

 and especially upon certain morphological characters, common or 

 transitional, on the usual habitat, etc. 



Now, having followed up this line of research for the last two 

 years, I think I may be able to give a direct demonstration of my 

 work, by indicating, so to speak, the explanation of the polymor- 

 phism of the various microbes lodged in the sputa. 



Moreover, in the preceding paper, several types of Bacteria 

 and Bacilli, for brevity's sake, were overlooked, as well as other 

 specimens drawn from further observations, f 



* This plate appeared in the April (1894) part of Journal^ and Figs, 4 to 

 16 will be found on Plate VI. of the present part. 



t Whilst again touching on Whooping-cough, and in continuation of our 

 bibliographical notices, we may mention a late article from Mircoli on " Renal 

 Alterations in Pertussis" [Arch. p. le Sc. Alediche, 1890, p. 63, etc.) Mircoli 

 inoculated, ineffectually, the cultures of bacteria, taken from the larynx of 

 children who had died from Whooping-cough, into the larynx or under the skin 

 of rabbits. He mentions articles from Sseurtschenho and Wendt, confirming 

 the observations of Afanasieff. In the Journal of Microscopy ajid Naiuj-al 

 Science, edited by Alfred Allen (January, 1890), there is a Lecture given by 

 Dr. Shingleton Smith before the Microscopical Society of Bristol ( "On Some 

 Recent Developments of the doctrine of a Contagium Vivum "), where (at p. 

 32) it is said that the efficacy of special micro-organisms in most of the con- 

 tagious diseases, and particularly in those most common to children, as 

 Measles, Whooping-cough, and Scarlet fever, is not proved. 



