8 On the Bridge of the Holy Trinity. 



we derive an ellipse whose semi-conjugate axis is -^^ — ^^\h. of 

 the transverse axis ; from which we may obtain the ordinates by 

 construction by Fig. 1, or by calculation as before; the angle 

 formed by the intersection of the curves at the vertices of the 

 side arches, will be 169°, 44', according to the formulae before 

 given. 



Fig. 3. The semi-span of the pointed circular arch in the 

 case of the middle arch from which the elliptical arch would be 

 an elongation (when r = the radius = 8, and the height =: c = 



B. S. D. B. S. D. 



7 16 6,) will be = r- >J ''^~-^ = 668. 



Fig. 4. In the case of the side arches, the semi-span will be 



B. S. D. B. S. D. 



4 9 1, the height being 7 3 5. 



Art. II. A History of a painful and obstinate Jffection 

 of the Brain, which ultimately yielded to the unremitting 

 Application of Cold, and the continued erect Position for 

 a week. % G. D. Yeats, M.D., F.R.S., Fellow of 

 the Royal College of Physicians, &c. 

 [In a Letter to the Editor.] 

 Dear Sir, 



I request the insertion of the following case in your Journal. 

 It illustrates, in a clear point of view, the good practical 

 effect of the application of cold, assisted by position, in obviat- 

 ing and ultimately curing the painful and dangerous conse- 

 quences of congestion of blood within the cranium, after th® 

 failure of other very active means ; and this morbid condition of 

 the brain succeeded to, and was connected with, a long-con- 

 tinued irritation in the digestive organs. 

 I am, dear Sir, 



Yours faithfully, 

 17, Queen-street, G. D. Yeats. 



Maxj Fair, Feb. 16, 1823. 



I was consulted by H J , Esq., aged 40, on the 



14th February, 1819. lie complained of general uneasiness, not 



