136 Analyses of Books. (Ave. 
other Instruments. By Captain Henry Kater.—It is not possible 
to convey an adequate idea to the reader of the method of gra- 
duating contrived by Captain Kater, without the assistance of 
figures. We must therefore refer those who wish to understand 
this important subject to the paper itself. 
Vil. Results of some Experiments on the Properties wmpressed 
upon Light, by the Action of Glass raised to different Temperatures, 
and cooled under different Circumstances. By Dr. Brewster.—The 
author found that a ray of light passed through hot glass was depo- 
larized; but when the glass cooled the original polarization was 
restored. Prince Rupert's drops exhibited the same phenomenon, 
together with the coloured rings, which characterise doubly re- 
fracting crystals. 
Vil. Considerations of various Points of Analysis. By John 
F. W. Herschel, Esq. F.R.S. The subjects treated of in this 
paper preclude the possibility of abridging it. 
IX. Observations on the Functions of the Brain. By Sir Everard 
Home, Bart. F.R.S.—The author conceives that it would greatly 
tend to promote our knowledge of the uses of the particular parts 
of the brain, if anatomical surgeons would collect all the observa- 
tions which they have an opportunity of making in cases of injury 
of that organ. The present paper contains an arranged collection 
of his own observations in the course of his practise. 1. A certain 
degree of pressure is requisite to keep up the functions of the brain. 
A diminution of it produces faintness, an increase insensibility. 
The water in the ventricles may increase indefinitely without in- 
juring the functions of the brain, if the skull expands in the same 
proportion. A curious example of this is detailed. 2. Concussion 
of the brain produces delirium and coma. 3. Sudden dilatation 
of the blood vessels of the cerebrum, in consequence of exposure 
to the sun, is sometimes accompanied by delirium, loss of speech 
and the power of swallowing. 4. Blood extravasated in the lateral 
and third ventricles was attended by repeated fits of vomiting and 
coma. Ivother parts of the brain it produced stupor, paralysis, 
idiotism. 5. The formation of pus is attended with delirium. 
6. Depression and thickening of different portions of the skull was 
attended with heaviness, torpor, head-ache, &c. 7. Tumors in 
different parts of the brain produced violent head-aches, apoplexy, 
loss of sight, epileptic fits, &c. &. Wounds in the anterior lobes 
of the brain produced no sensible effect. Loss of a portion of one 
of the hemispheres was attended with difficulty of swallowing for 
24 hours, and slight delirium of short duration. 9. In a boy in 
whom the tuberculum annulare had become indurated, the effects 
were, that the boy had been an idiot from his birth, never walked, 
spoke, or understood what was said. 10. Pressure upon the me- 
dulla spinalis produces paralysis. 
X. Further Experiments and Observations on Iodine. By Sir 
H. Davy, LL.D. F.R.S. V.P.R.1.—This paper is divided into 
five sections. 4. On the wiple compounds containing iodine and 
2 
