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"Bacillus subtilis, Cohn, and Spirillum undula, Ehrenb." — The Encyclopedia Britannica, 1910

Bacillus Subtilis

"Bacillus subtilis, Cohn, and Spirillum undula, Ehrenb." — The Encyclopedia Britannica, 1910

"Spirillum Undula, Ehrunb." — The Encyclopedia Britannica, 1910

Spirillum Undula

"Spirillum Undula, Ehrunb." — The Encyclopedia Britannica, 1910

"Spirillum Undula, Ehrunb." — The Encyclopedia Britannica, 1910

Spirillum Undula

"Spirillum Undula, Ehrunb." — The Encyclopedia Britannica, 1910