522 REPORT OF THE COMMISSIONER OF AGRICULTURE. 



DESCRIPTION OF PLATES. 



Plate I.— Ulcerated caecum of pig affected witli swine plague laid open. The mu- 

 cous membrane of the ileo-crecal valve is near the center of tlio figuro 

 and the small intestine with the cut end tied, above. The sraallcsr, ulcers 

 are of a uniformly yellow color; the larger ones with zones of different 

 color , the largest, brownish or blackish in appearance. 



Plate II, Fig. 1. — From a cover-glass preparation of the spleen of a pig afiected with 

 ewine plague. Drawn with Abbe's camera lucida. -jV homog. oc. 2 

 (x 800) ; a, red blood corpuscles distorted ; i, the bacteria of swine plague. 



Fig. 2. — Various colonies from gelatine plates, a, imbedded in the gelatine layer; b, 

 growing on the surface of the layer ; cc' c", growing between the gela- 

 tine layer and the glass plate ; a, b, about five days old (x 7.3) ; c c' c", 

 about seven days old (x 100) ; a, fails to give the idea of solidity. Tho 

 colony itself is either spherical or spheroidal ; b, on the other hand, is flat- 

 tened; e& c". the margins gradually attenuate and become lost to view. 



Fig. n. — Nutritive gelatine inoculated with a platinum wire from the spleen of pig 

 No. 114; about three days old; natural size; a, the colonics developing 

 from individual microbes. 



Fig. 4. -^Pasteur's second vacciue for rouget; dried on cover and stained in au"aqueou3 

 solution of methyl-violet ; mounted in xylol balsam; drawn with camera 

 lucida (Abbe), Zeiss, -jV homog. obj. ocular 2. The bacilli of rouget are 

 seen among the larger bacilli as slender curves or broken lines. 



Fig. 5. — Drawn same as Fig. 4, cells from a dried cover-glass preparation from the 

 lungs of a mouse inoculated with the second vaccine. Most of the bacilli 

 are within the protoplasm of the cells. 



Fig. G. — Culture in meat infusion peptone gelatine inoculated from plate cultures of 

 Pasteur's vaccine I; 12 days old. The appearance is that of a row of 

 faintly circumscribed, cloudlike masses in the track of the needle which 

 i'i itself scarcely visible as a delicate lino. No liquefaction perceptible. 



