the Croonian Lecture. 
195 
Fig. 2. Shows that when the colouring matter is removed, 
25 globules occupy the same space. 
Fig. 3. Shews that the globules, deprived of their colour- 
ing matter, and allowed to float in the coloured serum, when 
once in contact, appear to adhere in a manner not seen 
to take place when the globules are enveloped in the colour- 
ing matter. 
These three figures are magnified 400 diameters, or 160,000 
superficies. 
Fig. 4. Muscular fibres from the thigh of a boiled chicken 
magnified 400 diameters, or 40,000 superficies. 
Fig. 5. One single fibre. 
Fig. 6. A fibre to shew a variety in its form. 
The two last figures are magnified 400 diameters, or 
460,000 superficies. 
These fibres in their diameter correspond nearly with the 
globules of the human blood, deprived of their colouring 
matter. 
Plate IX. 
Represents the appearance which a drop of blood puts on 
immediately after it has been taken from the arm into a 
watch glass, and magnified 25 diameters, or 625 superficies. 
That this appearance is produced by the carbonic acid gas, 
which is separated from the blood in the act of coagulation, is 
proved by no such appearance being met with when that gas 
has been previously removed by exhausting the blood in an 
air pump. 
