. Electro-physiology . Fie. 35c.—Four contraction curves of different muscles of Tortoise under uniform conditions. The time-tracing is in seconds. muscle of E. csculcnta, 32 mm. long, contracted about 2'6 times less frequently at medium tension than the gastrocnemius, which was only 28 mm. long. The height of lift recorded (enlarged) amounted to 6 and 15 mm. The sluggish hyoglossus, 26 mm., has, at approximately proportional tension, a height of twitch of 1'5 mm. only (Griitzner). llollett (8) has recently pointed out a remarkable instance of

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Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublisherlondonmacmillan