Notes on the Plates. 



Plate 1 is described on pp. 124 and 127. i 



Plate 2 is described on pp. 140—143. 



On plate 3 small sections of the microscopic appearance of 

 fuchsin-stained dry preparations are reproduced from pencil sketches, 

 at a magnification of 1500 in each case. Two colonies are also 

 shown diagrammatic-ally, — at a magnification of about 10, - with 

 centrally grouped and with scattered granules respectively. 



In parenthesis the „number of the generation" is given and 

 the medium employed, B = blood agar, BB = brown blood agar 

 („chocolaie" agar), H = haemoglobin agar, F = Fildes agar, A «= 

 ascitic agar (with a minute normal content of haemoglobin), S = 

 „symbiosis" plates. 1 H therefore signifies that the preparation is 

 from a colony on the original plate which consisted of haemoglobin 

 agar; 2 B denotes a culture on blood agar derived from an inocu- 

 lation from a colony on the original plate. 



The illustrations of the same strain, even when they depict 

 different cultures, are arranged in close proximity (e. g. the 4 illu- 

 strations of I 14). Illustrations of different parts of the same pre- 

 paration are furnished with a common subscript (e. g. the illu- 

 strations of I 14 (2 B)). 



All the illustrations surrounded by a continuous line exhibit the 

 elements in their actual position in the preparation but in the illu- 

 strations enclosed by an interrupted line the assembled elements 

 are chosen from different parts of the same preparation. The 

 figures which are collected under the common heading „Various" 

 are however taken from preparations of a number of different strains. 



In I 28, * signifies a culture grown 6 days later than the ori- 

 ginal culture; **. cultures which were grown 6 days later than 

 those marked with *. 



In I 65, S* signifies a preparation from the luxurious portion 

 of the growth in a symbiosis test, S**, a preparation from the weak 

 growth outside the effective zone of the foreign bacterial colony 

 in the same culture. 



The mam object of this plate is to give an idea of the whole 

 series of forms of the species Pfeiffer's bacillus which may be 



