GLOSSARY. 173 



Farad'ic current. The induced or interrupted electric 



current. 

 Far point. Indicates the distance to which an object may 



be removed from the eye and remain distinct. 

 Fechner's law. There is always a constant ratio between 



the strength of the stimulus and the intensity of 



sensation. 

 Fibrin ferment. An influence or ferment obtained from 



blood or serum by alcohol, and which has the power of 



converting soluble fibrinogen into insoluble fibrin. 

 Fibrin'ogen (a hybrid from L. fibra, a fibre; and Gr. gen- 



nao, I produce). A globulin occurring in solution in 



blood which is converted in fibrin by action of fibrirF 



ferment. 

 Filtra'tion. The passage of a fluid through a porous medium 



dependent upon pressure. 

 Fleuren's doctrine. That the whole of the cerebrum is 



concerned in every psychical process ; hence if the greater 



portion of cortex be removed the remaining part can 



carry on the functions of the whole. 

 Floc'cular fossa. A depression in temporal bone which 



lodges the flocculus. 

 Fontana, Spaces of. Small canals situated at junction of 



cornea and sclerotic ; concerned in regulating the tension 



of the eye. 

 Fora'men caecum ([,. foramen, an aperture homforo, I bore; 



cacus, blind). The opening of the thyroid duct at back 



of tongue. 

 Fora'men of Majendie. An opening situated at posterior 



and inferior part of fourth ventricle. Said to connect this 



cavity with subarachnoid space. Its existence is doubted 



by many anatomists. 

 Fora'men trio'sseum. An opening formed by coracoid and 



'arcomion processes and body of scapula. Transmits the 



levator humeri. 

 Forced movements. Certain phenomena resulting from 



division or disturbance of corpus striatum, optic thalamus, 



&c. Circus movements. 

 Fore gut. That portion of embryonic digestive canal from 



which is formed stomach, aesophagus, upper half of 



duodenum, lungs, liver, and pancreas. 

 Fro 'man's lines. Transverse markings on a nerve axis 



cylinder when stained with silver nitrate. 



