. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. NUTRITION. 755 difficulty of respiration. It is in the different forms of tubercular deposit that we see the gradation most strikingly displayed between the euplastic and the aplastic formations. In the semi-transparent, miliary, grey, and tough yel- low forms of tubercle, we find traces of organi- zation in the form of cells and fibres, more or less obvious; these being sometimes almost as perfectly formed as those of plastic lymph, at least on the superficial part of the deposit, which is in immediate relation with the
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. NUTRITION. 755 difficulty of respiration. It is in the different forms of tubercular deposit that we see the gradation most strikingly displayed between the euplastic and the aplastic formations. In the semi-transparent, miliary, grey, and tough yel- low forms of tubercle, we find traces of organi- zation in the form of cells and fibres, more or less obvious; these being sometimes almost as perfectly formed as those of plastic lymph, at least on the superficial part of the deposit, which is in immediate relation with the living structures around, and sometimes so degen- erated as scarcely to be distinguishable. In no instances do such deposits ever undergo further organization, and therefore they must be re- garded as caco-plastic. But in the opaque, crude, or yellow tubercle, we do not find even these traces of definite structure; for the matter of which it consists is altogether granular, more resembling that which we find in an albuminous coagulum. The larger the proportion of this kind of matter in a tubercular deposit, the more is it prone to soften, whilst the semi-organized tubercle has more tendency to contiaction. Fig. 406.*. Microscopic appearances of tubercular matter in the lungs, after Gulliver. To the left, magnified 190 diameters, is shown a central portion of tubercle, from the lungs of a man aged 22, who died of pulmonary consumption; the tubercle is contained in the air-cells, and surrounded by the fibres of their walls. To the right is depicted some of the same tubercle, separated and magnified about 820 diameters. Now although tubercular matter may be slowly and insidiously deposited, by a kind of degradation of the ordinary nutritive process, yet it cannot be doubted that inflammation has a great tendency to favour it; so that a larger quantity may be produced in the lungs, after a pneumonia has existed for a day or two, than it would have required years to generate in th
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