. Canadian journal of agricultural science. Agricultural Institute of Canada; Agriculture. 60 S C I E N T I F I L- AGRICULTURE. February, Fig. 1. Fig. 2. Plate II.—The bacteria causing the root nodules on legu- minous plants, y^ 1000. Fig. 1.—The normal vegetative form showing the whip-like polar flagellum, the means of locomotion. (Cowpea bacteria-) Fig. 2.—The so-called "; (Red clover bacteria). attack and destroy an animal thus defeating their own ends, so the nodule bacteria destroy their own house over their heads; they are set free in the soil and must rely up
. Canadian journal of agricultural science. Agricultural Institute of Canada; Agriculture. 60 S C I E N T I F I L- AGRICULTURE. February, Fig. 1. Fig. 2. Plate II.—The bacteria causing the root nodules on legu- minous plants, y^ 1000. Fig. 1.—The normal vegetative form showing the whip-like polar flagellum, the means of locomotion. (Cowpea bacteria-) Fig. 2.—The so-called "; (Red clover bacteria). attack and destroy an animal thus defeating their own ends, so the nodule bacteria destroy their own house over their heads; they are set free in the soil and must rely upon chance providing a new opportunity. The Bacteria. The bacteria, for such they were found to be, are peculiar, that is if we may speak of any bacteria as being peculiar. They are able to exist in several dif- ferent forms, so different that one could scarcely believe them to be the same organism. This char- acteristic we term polymorphism. The common ve- getative form is the small rod-shaped organism. Fre- quently they exist, as small oval bodies much smaller than the vegetative form called swarmers from the German "schwarmer" as described in the early liter- ature. The most characteristic forms and those which identify the species are the branched X and Y forms commonly called bacteroids, a misnomer since bac- teroid means something resembling bacteria, but which are not bacteria. Obviously the bacteroids are bac- teria just as much as are the other forms. These peculiar forms exist frequently as huge threads with swollen end. sometimes branched to form an X or Y and sometimes variously branched with no evident scheme. In this form they are much larger than the vegetative form and more resemble fungi or actinomy- ces than they do bacteria. This polymorphism led to controversies in descrip- tion, in classification and in naming. No less than about twenty different names have been proposed for this helpless, unsuspecting creature, such names as Schinzia legvmin
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