The surface of the specimens subjected to a modified Golgi technique (formalin fixed material; specimens in the following solution for 8-10 days at 27 C: 3 K2Cr2O7, 100 ml, with the addition of 2.5-10 ml of 10 formalin and 6-25 gm of sucrose; then in 0.75 AgNO3 for at least 2 days at 27 C) is sometimes covered with a fur of filamentous crystals and sometimes with a powdery precipitate of laminar crystals. In a series of experiments in which about 500 blocks of tissue were treated with variations of the staining procedure, good axonal stain was positively correlated with the appearance of filamentous crystals. These filaments have a thickness of 1-4 μ and grow at a rate of 160-330 μ/hr, reaching a length of 2-7 mm

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