698 PROCEEDrNGS OF THE SOCIETY. 



covered against risk by fire at the expense of the committee. Among the 

 17 groups is one for "Instruments of precision, with subdivision for 

 Microscopy," as well as one for " Instruments and apparatus aiding instruc- 

 tion in Natural History." Applications should be addressed to the 

 " Ausstellungs-Committee der 60. Versammlung Deutscher Naturforscher 

 und Aerzte," or to Mr. Dreyfus, 44, Frankfurterstrasse, Wiesbaden, where 

 also further particulars can be obtained. 



Dr. E. M. Crookshank exhibited a series of cultivations of micro- 

 organisms, and called attention to the somewhat unusual circumstance of 

 being able to show such a typical series all growing at the same time. 

 Many of the kinds exhibited were by this time tolerably familiar to those 

 who were interested in such subjects ; but there were one or two of more 

 particular interest about which he would say a few words. He had some- 

 times drawn attention to the fact that the chromogenic bacteria generally 

 develope their colour only on the surface of the gelatin, but a specimen now 

 shown formed an exception to this rule. It was interesting as being the 

 first Spirillum which had been cultivated artificially, and being a chromo- 

 genic Spirillum had developed its colour in the depths of the gelatin 

 contrary to the general rule. Another specimen was that of Bacillus 

 figurans, seen growing upon the surface of the gelatin. When first 

 described, some persons were sceptical as to the fact of a Bacillus de- 

 veloping such a symmetrical pattern ; but it could now be cultivated quite 

 easily, and he should be happy to supply any one interested in the matter 

 with material from which it could be grown as symmetrically as in the 

 example before them. He also showed a micro-organism which had been 

 said to cause the swine fever — or rather, the swine erysipelas — in Germany. 

 It was to be noted that in Germany there had been many cases of swine 

 disease, and that a different organism had been found associated with it 

 there from the one found here and recognised as the cause of Dr. Klein's 

 swine fever. So far as he (Dr. Crookshank) had been able to make out, 

 they were not identical, the German form being an extremely minute 

 Bacillus forming only a cloudy appearance, and seeming to be similar to 

 mouse septicaemia. He thought there was good ground for regarding the 

 two diseases as distinct from each other, the German form being swine 

 erysipelas as distinct from swine fever. He also exhibited an example of a 

 Bacillus obtained from putrid fish, which caused the remarkable phospho- 

 rescence frequently noticed when fish was decaying. 



The President complimented Dr. Crookshank on the remarkable series 

 which he had exhibited, illustrative of a department which he had made so 

 much his own. 



Mr. Freeman exhibited a number of series-sections of the anatomy of 

 spiders, worms, &c., which had been made by Mr. Underbill, of Oxford. 

 They were rather remarkable specimens of section -cutting and mounting, 

 in some instances from 30 to 60 consecutive sections having been obtained 

 from the same spider. Some drawings taken from the slides were also 

 exhibited. 



The President, referring to a drawing of a longitudinal section through 

 a spider, showing all the organs in situ, asked if the section from which 

 this was taken was included in the series exhibited ? 



Mr. Freeman said that this drawing was not taken from any one 

 section, but was a composite drawing intended to show the internal 

 structure as revealed by the examination of a great number of sections. 



